I just bought (September 15, 2020) a Galaxy Tab A 128 GB with Android 9.0 for $199 at Costco.
This model has not recieved a security update in more then 2 years, and is no longer supported. I can’t justify buying one for more then 50 bucks, don’t expect it to work for most apps either.
I paid 299.00 years ago for this. Mine works perfect no problems at all. However if you try to sell it they only offer $8 bucks. Since it’s so old someone is making bank on this.