haha i dont think this will help you, but the cheapest place to get Rotas are in the FDM - Filipino Domestic Market.

Since Rota is based out of the Philippines, i've been told by cousins and friends that 15's go for 300 or so for 4, 350 or so for 16's and 400 or so for 17s, with no tires....

thats about the cost on them...so just keep those prices in mind when you do your price matching..

hope this helped you out