I auction here every now and then and I don't think you can actually change what you post as the retail price of the unit. I think you can only add something, in which case where the seller can add that the retail price posted was Canadian dollar not US dollar.
Correction to Bryston SP-1 auction above
Bidders -- please take note. There is an auction posted above for a Bryston SP-1 pre/pro that has an error. The MSRP shown for the unit is $5495. That is the Canadian price, not the U.S. price. The MSRP in the U.S. is $3800. I notified the seller yesterday of this error, but no correction has been made yet to the listing.