Posted By:
cmokingI don't think you have any obligations to the first emailer, but I do think the first emailer will have a problem with you if he emails you back wanting the card (after seeing the scan) and you tell him it is sold. He's going to think: WTF, you didn't know I was interested in the card when I asked for a scan?
I'd tell the second emailer that he's second and I'd get back to him ASAP. Then I'd email the first emailer and say, you gotta give me an answer soon please...and set a deadline.