Migrating Marketpress Products To A New Store

Hi Guys
My client currently has around 8 marketpress stores and wishes to combine all his products (around 2500) into a single store.

Can anyone recommend a quick and simple method of migrating/copying the products and all their custom fields, images, shipping costs etc to the new store... Or do I have a lot of copying and pasting to do? :slight_frown:

Thanks in advance

Justin