Global Site Search won't search Product pages in MarketPress.

Building an etsy-like site for eCommerce with WPMU and MarketPress. Need some way to globally search through all Products (similar to etsy).

Have tried both WPMU Global Site Search and the seemingly newer MultiSite Global Search by the same author. The newer one does seem to search regular pages, but not MarketPress Product Pages (my understanding was that each Product creates a Page.

Any help on how to do a global search of Products in MarketPress across all sites in a network greatly appreciated.