It appears they are selling these 2500 at a time for one price. Once they sell out of that 2500 they magically list 2500 more at a new higher price. I think they have done this atleast three times this morning and that explains why they are now at $48.
I guess it pays to be early with this series. The price went up $20 per coin in only 1 1/2 hours. Crazy!