Train travel from Berlin to Hamburg

Always go to the website of the company running the trains, not a reseller.
DB = Deutsche Bahn = German Railways. Website: https://www.bahn.com/en/view/index.shtml
I find it hard to believe that Go Euro can be cheaper than DB, they are reselling DB tickets.

Berlin Hbf is the main station in Berlin where all the long distance trains stop, including from Hamburg.
Hbf = Hauptbahnhof = Main station. The main station in any Germany city is called "Hbf", you will be starting from Hamburg Hbf. Alexanderplatz is just an S-Bahn (local) station.

I picked a random date in March, Hamburg Hbf to Berlin Alexanderplatz. The DB website said €29.90, changing at Berlin Hbf, then 6 minutes on a local train to Alexanderplatz. Did you perhaps enter something wrong on the DB site?

No way can Go Euro beat DB's price. I see 29.90 EUR Super Sparpreis tickets for 1 month from now. That is $34 US at current rates. You just specify Berlin Alexanderplatz and it will include the connection by S-Bahn to Alexanderplatz.

BTW, the Flexpreis (any time) ticket is 83 EUR at DB, so Go Euro is showing 89.70 EUR, indicating they have an 8% mark up.

I certainly must have done something wrong because I show Berlin - Hamburg (going that direction not Hamburg - Berlin) on DB site at 89.70E 2nd class. So I'll do again at the link you provide.

So if I pick up the train at Alexanderplatz, that's a local train? (S-Bahn), and then I'll have to change at main station for train to Hamburg? Or should I just go to main station and take the train from there? Easier or no difference?
Thanks for reply.

I'm still not getting the lower price. Still showing 89.70EUR:
https://reiseauskunft.bahn.de/bin/query.exe/en?ld=38202&protocol=https:&seqnr=2&ident=0h.023325202.1550682070&rt=1&OK#focus
How do I get that 29.90 EUR Super Sparpreis ticket?

@OP: The price is for 3 adults; clearly standing there. So where is your issue? Also enter Alexanderplatz as departure.
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It is definitely possible that some contingents are cheaper offered than by DB itself. This is lived sales strategy since years in different ways but not made public. Also possible that they use special travel agent contingents which were originally blocked for "Zug zum Flug" (train to flight). There are also tricks for regular consumers to get the same distance and train booked cheaper on other portals.

Super Saver Fare and Saving Fare are not always available, especially between major cities at rush hours or around school vacation periods.

For regular traveler with language barrier: check DB website first. Also easier when issues arise during journey, e.g. delays, ...

We will be staying near Alexanderplatz in Berlin. Can train to Hamburg
be gotten from that station?

Enter start and destination address when booking on DB website. One train switch necessary at Berlin Hbf that needs around 10 minutes from upper platform S-Bahn to lower platform (tief) - very often track 16 to track 8 or 7.

Isn’t your 89€ price for 3 tickets? That’s what your link shows.

No it shows 89.70E each, 249E total

Oh, or is the 89.70 for 3 2nd class and 249E for 3 first class?
That may have been my error.

Just READ what is standing above the price, "Saving fare" left and "Flex price" right.
"Price for all passengers including discounts*"

The "Saving Fare" is non-refundable and non-changeable. The "Flex" fare is refundable/changeable, though I don't know whether there might be some sort of administrative fee.

It is common in Europe to have at least two levels of fares available for the same class of service on express trains. The non-refundable tickets are screaming bargains and tend to sell out rather early. The refundable tickets are comparatively pricey and may be available up to the day of travel, though trains do occasionally sell out around holidays, etc.

The overview of the three different fares for individuals (not groups) you will find here:
https://www.bahn.com/en/view/offers/index.shtml

If you are looking to save money, you could also travel with local trains on a Schoenes Wochenende Ticket for 56 EUR (about $22 per person for a group of 3). It would take twice as long, but would leave from Alexanderplatz S-Bahn station with a single change at Schwerin. And you could take any train that day and not have to buy it until right before you leave out of the DB vending machine at the station.

Then there is always Flixbus.

you could also travel with local trains on a Schoenes Wochenende Ticket

@Sam
Please note that the SWT will not be available any more from june, 9. The "Quer durchs Land" ticket will still exist, but unlike the SWT it does not include city transport.

Ruby, it clearly says (this is a copy paste from your link):

Berlin Hbf Hamburg Hbf dep: 14:00
3 adults, 2nd class
Price for all passengers including discounts*
89,70 EUR

€89.79 ÷ 3 = €29.90 per person

€249 (€83 per person) is the price for 3 people on a "flexi" ticket, valid on any train. €29.90 is the"Sparpreis", just valid on whichever train you select.

Thank you all for your patience and help. Got it now.
How far in advance do you think I need to book tickets?

@scythian: thanks for all that info -- appreciate it! Interesting details.

Tough to say. Right now, you can still get that 89.70 for 3 price this coming Sunday if you buy today. But summer will be a busier travel time and those cheap tickets probably will not hang around as long. I'd check periodically. If you see some of the prices go up on the early morning departures, its time to buy now. Otherwise, buy when your plans a fixed and set in stone.

sla Thanks for the heads up that the SWT is going bye-bye. The QdL is only 4 EUR more for 3, but I don't see why it would not be valid on S-Bahn trains. From the "means of transport" at the DB website.

All regional trains (RB, IRE, RE) and rapid transit trains (S-Bahn) operated by DB and other cooperating railway undertakings

Certainly not on U-Bahns, trams or buses.