re: Anyone here collect autographed sports memorabilia?

Unfortunately, you’ll be restricted to buying from JSA or PSA authenticated items. There are tons of eBay sellers that will sell you an item they say has a COA, and the COA is just a slip of paper saying the seller authenticated it.

I have probably 2,000-3,000 autographed cards, some jerseys, helmets, bats, etc. Honestly, one of the best ways to check is to compare what you want to buy to pictures of authenticated autographs from the same athlete.