munich to fussen with Bayern ticket

www.bahn.com has the schedule. For the return trip, specify Oberammergau as a stop over and see what happens.

Bahn.com informs me that the ticket costs more than 113 Euros. Bayern ticket is 43 for 4 persons. Also that from Fussen to Oberammergau takes about 4 hours Probably going thru Munich, because Oberammergau is very close to Fussen. Again, where can I get the schedule and right price for the Bayern from Munich to Fussen. Thanks.

"Again, where can I get the schedule and right price for the Bayern from Munich to Fussen."

Sam provided you with a link to the correct source.

If you cannot find the Bayern ticket price, you are entering the wrong information or looking in the wrong place.

It's easier to start from this page:
https://reiseauskunft.bahn.de//bin/query.exe/en

When I enter June 17, 4 passengers, I see a price of €40 available for all journeys in the "savings fares" column. That's the price for the Regio-ticket Allgäu-Schwaben. For any of the journeys, if you click on the red box "to offer selection", you will also see the Bayern Ticket option, priced at €43. Both ticket options are day passes and valid for the trip back to Munich as well on the same day - read the details.

Fussen to Oberammergau takes about 4 hours

That's probably by train via Munich. Füssen to Oberammergau takes about an hour and a half by bus. The last bus from Füssen to Oberammergau leaves Füssen about 5 pm. The Regio-Ticket Allgäu-Schwaben doesn't cover buses, but the Bayern-Ticket does.

Bingo! Thanks Russ. I finally found the right information. Thanks to everyone that tried to help. I think that this Steves Forum is the best group of friendly people. Thanks again, Jay

Hello, I am making the same trip in July and saw the ticket was 37 euros for 3 people at certain times, and much more expensive at others. Do I need to book in advance? I thought I could just get Bayern tickets at 37 euros on the day of travel but want to know for sure! Thanks.

I thought I could just get Bayern tickets at 37 euros on the day of travel

You can. I don't know what you are seeing for more than 37€ for three - perhaps the full fare ticket for travel before 9 am, perhaps a 1st class Bayern-Ticket. The 2nd class Bayern-Ticket is always 37€ for three people (all day Sat, Sun, Holidays, after 9 am workdays).

Do I need to book in advance?

Not the Bayern Ticket. You can pre-purchase it online - but if you do, you aren't "booking" anything - no seat is reserved or guaranteed with purchase - and it's not possible to reserve or guarantee seating with regional train tickets anyway. There is generally zero advantage if you choose to pre-purchase. Buying at the station from a ticket machine is normally the best appraoach.