Dispute about Haflings card selling

Ok. The player with the hafling is selling one item at double price, say a 800 gp item, which then becomes 1600 gp. Now the player also puts down another item worth 600 gp, wanting to get two levels out of both items. I disputed, thinking that the item being doubled in price isn't to be counted in one sell for two levels, but because it was specially priced it had to be considered a sell all to itself.
Which is the correct line of thinking here?

Dispute about Haflings card selling