I have listed previous coins on the GC forums and will with this one too.
As far as discounting the coins, I've calculated the costs on the last two coins pretty close. The $50-75 that I've been over has stayed in the account and rolled into the next coin. So far I haven't gotten burned, so I'll keep doing it this way. As far as paypal and prepays, I know they are pretty sketchy about prepays, but I'm not financing $2-4000 up front for coins that I may or may not sell. If I'd ordered half as many 2007 coins as I sold in '05, I'd be sitting on about 500 of them right now, ouch. Nobody has complained about prepay so far..... I'll keep my fingers crossed.