I didn't think we BIN fans would have the burden of proof in State v. Bidiots,
but since we are sharing: my best card is a well centered '33 Goudey Gehrig PSA 6.5 (posted in another thread) that I picked up for roughly the SMR price between 6 and 7. Not a "steal" but considering that a less well centered 7 just sold at auction for more than $2k more, I'm happy with the price.
The sellers I find reasonable (not meant to be a complete list) are: bbcinv, omegalm1, and Cooperstown (I forget their actual name). Anyway, I've found with 5 minutes of research you can likely reach the seller directly and get a better price through a direct sale.