Yes besides your own. Lol. But shameless plugs are acceptable. 
Rookie-Parade is high on my list. Those guys know how to sell cards. 
 
Painthistorian offers great deals....99 cent auctions on sgc graded
I honestly do love PWCC although I just see it as a big machine. Again, 
I also get great deals on sgc graded from them. 
Invest let’s nice stuff rip at 99 cents. 
Oh and hey, there was one time I bought something from battlefield and I didn’t return it. 
Any similar commentary is appreciated. Thanks.