I'd expect w/c or F1 in pristine condition for that kind of price. I've bought F1 festae at that size for that price.
Keep in mind that that fish was likely given to the LFS for $5 store credit or free because the person who owned it couldn't house it anymore. The lfs probably doesn't have much/any invested in the fish, and if they can unload it and make few bucks, they probably will.
Go in and tell them you'll give them $20 for it. Worst they can say is no.