@pbe gummi bear has his WhereYouAt? map. We could just draw circles around clusters for groupings.
Probably would have to block gerrymandering maneuvers by ChiTown fellas to stop them getting all the cool kettles. Oh, well. We aren't going to catch up with them anyway.
I did just recently join a local mailing list that does watch the sales sites. That could very well serve instead of adding more topics. The proposed new topics are intended to be a "Hey, heads up! Cool kettle near you!" right? Or, "Can you help me get this?" Mailing lists might be a better option.