Sub-domain for ecommerce website

Hi Folks,
I've built a website for a publisher (www.cubola.com) who sells to overseas customers in US dollars and the prices include shipping. They'd now like to be able to sell within Belize in Belize dollars with variable shipping prices depending on location. The prices are currently in USD so I'm thinking of copying the products to a sub-domain (belize.cubola.com) and changing the prices and shipping options there. Do you think that is the best way to handle this? It's not possible to use a currency conversion because of the built in shipping costs. Do you foresee any problems or downside to doing it this way?
Thanks!