I need to file for 2021 2022 and 2023. Can I file all of them under the same product that costs $80 or do I have to do buy each one separately?

[VolvoGirl]

Sorry you have to buy each year separately.  For 2023 you can use the Online version until Oct 15 or buy the Desktop program here,  https://turbotax.intuit.com/personal-taxes/cd-download/ 

You can buy the last 3 years of Turbo Tax here,

https://turbotax.intuit.com/personal-taxes/past-years-products/

You will need a full Windows or Mac to install it on.

How to prepare a prior year return

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-prior-year-tax-return/00/25...

Or if you want to file for free and have a simple return you can get the blank forms from the IRS and fill them in by hand.  I have a list of some of the basic ones I can post direct links to.