I buy occasionally from Dean's for the reasons mentioned by Cliff. Good front and back scans if you are looking for off beat cards.
I buy from Levi because I like his hat. He does take checks and if you are a customer he sends cards, even high dollar items, for approval before payment . And he is honest.
Yep is high and does not seem very flexible, but he does have some unique stuff.
Some people have cards that they do not want to sell unless they get their price. This can be annoying to people who want to buy those cards at prices they would prefer to pay.
Do not know about Yep, but Dean and Levi seem to be doing ok
