mm1220 - 7:23 pm on Mar 9, 2006 (gmt 0) Think of the 20% as aggravation costs.
Considering that he's still willing to order after your kerfuffle with him I reckon that he really must need your product. Send him a civil email saying that you'll sell it to him for whatever it costs plus 20%. Don't say that in the email though, just put down the dollar amount. He'll probably go for it.
Think of the 20% as aggravation costs.