nothing compares TCDB! its basically all i use anymore,
DiecastCrazy.com(DCZ) is an awesome community, Not much for cards but great for diecast and general racing collectibles, great racing discussion and amazing helpful members.
Facebook groups, most of my buying now is done through facebook groups, I pretty much just stick to Dime sales or will buy a flat rate box of cards. When i make a transaction on a facebook group ill usually ask if they a TCDB SCF or DCZ account and will run a transaction if they do. If anybody knows anyother pages that have dime football sales other than (tristate, baseball card fires, or house of sportscards) let me know
I used Sportscard forum before i came here, i'll still use it i've got a facebook transaction and we both are members. There is an aewsome TTM Database on there which i used a ton until i found out how to trade on here. Didn't really have any luck doing trades but did some buying and selling, They had a system where if you had less then 10 transactions or so many bad transaction that person would be required to send first, which i wish was a thing here. But the over all community wasn't as friendly as it is here.