Is MarketPress Product Price stored as a Custom Field?

I'd like to use the fantastic HTML Import 2 (http://wordpress.org/plugins/import-html-pages/) to create products in MarketPress. With HTML Import 2 you can select clean HTML markup and import to Custom Posts including MarketPress Products. You can also import clean HTML markup as Custom Fields. In order to better differentiate the mapping process, does MarketPress use custom fields for Price, Image, etc.? Thanks!