Hi all. Hope it's ok to post this here. I've been offered some Transformer erasers by a coworker and neither of us has any idea how much they are worth. As I want them as a surprise for my husband (the only expert I know) I can't ask him. I checked ebay, but there's not much there to help. Any suggestions? My main concern is that I don't want to cheat my coworker... But then I don't want my husband to say I spent too much either!