Just got a message from bigdealsmart on eBay. They now have their own site:
Big Deals Mart. Bringing Big Deals in Quality Healthcare and Shaving Products. Gillette, Feather, Parker, Polsilver and lots more.bigdealsmart.com
I now also know that they're called Big Deals Mart and not Big Deal Smart.
This. Rather like finding out you've entered an amateur swordplay competition instead of an amateurs wordplay competition.