Google's supposed Amazon Prime competitor is taking shape thanks to a leaked email acquired by TechCrunch, though it might not be what we were expecting—at least initially. It sounds like Google Shopping Express is currently confined to San Francisco's Bay Area, and exclusive to retail locations such as Target, Nob Hills Foods and Babies "R" Us, of all places.

According to the email, a yearly membership price hasn't been finalized, though it does say that non-members will pay $4.99 per delivery per store. TechCrunch said its sources confirmed "eight stores in the Bay Area." Right now, it's unclear if Google Shopping Express will infiltrate other areas following testing of the service, although we imagine that it will.

TechCrunch's original report said the service would undercut Prime by $10 or $15, but that price is allegedly "still in flux." Maybe once further testing is performed we'll hear official confirmation.