I've seen listings like that on
ebay that start at $5 and maybe it won't sell, or maybe it'll get $10. I see a few stamps there worth a few dollars each, nothing astronomical, especially in mixed condition. Depending on which watermarks and perforations on those stamps, maybe there's $50 catalog value there, or maybe a lot less, so if both the buyer and seller will be happy with the deal at $20 then go for it.
I see that there are more pages in the stack besides the two pictured, are they also included in the $20 offer?
Quote:
someone has offered to pick them up in the morning for that much
Under what circumstances did you meet this person who made you this offer? Someone you know? Someone you met on Craig's List? Honestly $20 seems like a lot for that small group of stamps, sight unseen. If you don't know who this person is, be alert, and take a friend with you when you make the deal. If anything seems fishy, walk away.