It seems like all we post at the moment is minor hints. Anywayz, here's clue 3 for frame 4. With us? Good.
A big thanks to '1st time caller' for the info. The image on DCPB matches an image on crumbs.com - confirming that this is the place where frame 4's URL will be. But at which store? New York? California? Or at all of them?!