I've used Blowout, Dave & Adams, SteelCity and DCS sports cards! They're all good and sometimes better at certain times. One might be better on Fathers Day, others on Black Friday. Depends on the day, depends on the product. Shop them all compare prices and like JacobyStealsHome suggested, hop over to eBay and see what you can find there. I've heard that sometimes LCS guys get some killer deals and if not, the "instant gratification" element is worth paying a little more!
I guess if I saved used tinfoil and used tea bags instead of old comic books and old baseball cards, the difference between a crazed hoarder and a savvy collector is in that inherent value.