Entrance Fees

It's simply too early for those tix to be booked.
Check back closer to your trip- maybe 60-90 days out?

No dates listed for May 2020 or we have to book through a third party which are tours.

Way, way too early. If you buy the tours, you are paying purely for the tour. The tour company will buy the tickets when they come out, after sitting on your money for months.

Cindy, as Christine said, you're too early for tickets to be available for some attractions, such as the Colosseum. However, what museums are you trying to buy tickets for in Florence? Messing around with a dummy booking, it looks like you can buy May 12th entry tickets for the Uffizi at this time (it's closed on Monday, May 11th as are all of Italy's State Museums).

Ordinary access tickets (which is what you're wanting to purchase) for the Colosseum/Forum/Palatine are sold on a quarterly, monthly, weekly and daily (for the following day) basis. Here's how that schedule currently works; under the "NEWS" section of the website (all times stated are ROME time):

https://www.coopculture.it/en/the-colosseum.cfm

"CALENDAR WITH THE GRADUAL RELEASE DATES OF TICKETS WITH SCHEDULED ENTRANCE OF THE COLOSSEUM:

DAILY OPENING
Every day at 3.00 pm (UTC+1) new tickets for the next day

WEEKLY OPENING
Every Monday at 5.00 pm (UTC+1) new tickets for the following week

MONHTLY OPENING
Every first Tuesday of the month
Pre-sale of tickets with scheduled entrance time for the ordinary access of the Colosseum
(Ticket sale times currently showing are JUST for Dec. Jan. and Feb. and vary by month)

QUARTERLY OPENING JANUARY-FEBRUARY-MARCH 2020
Tuesday, November 19th at 6.30 pm (UTC+1)
The pre-sale of the first set of tickets with scheduled entrance time for the ordinary access of the Colosseum, of tickets with scheduled entrance time to the Colosseum arena, in the quarterly availability for the months of January, February and March 2020 will be released both online and by call center.

Wednesday, November 20th at 6.30 pm (UTC+1)
The pre-sale of the second set of tickets with scheduled entrance time for the ordinary access of the Colosseum in the quarterly availability for the months of January, February and March 2020 will be released both online and by call center. "

Obviously, tickets for the 2nd quarter (April/MayJune) are not on sale yet so just keep an eye on the site. Also, be cautious about ticketing info in your guidebook? There were a fair amount of ticketing changes to the Colosseum/Forum/Palatine and some of the Florence museums this past year - mostly concerning use of passes - AFTER guidebooks went to press so best get your info from the websites themselves. The RS staff also does a good job of noting most after-press changes here:

https://www.ricksteves.com/europe/guidebook-updates

@Kathy, FYI, posts are listed in the time zone configured on your computer.
The post in question shows on my computer as:

11/22/19 02:29 PM

Which in English would be: 14:29 22/11/19

LOL, Chris, I spaced off the time thingy (more coffee, please) so thanks for the reminder!
The mods have also nicely cleaned up that spammer so I've bizbagged the report. Back to our regularly scheduled topic. 😁