A few years ago a D304 Cobb came on ebay with a BIN. I must have been the first person to see it. I emailed the seller and asked if I could return it if it were found to be a reprint. The seller immediatley responded and said "yes". I BIN'd it, submitted it and got it graded for about $500. The card actually presents better than the grade.
I picked up one of those 4-1 Goudeys with three HOF players. I probably paid less than $50 for it. I sat on it for a while then submitted it and it came back an SGC84.