The Knifecenter does the same thing, as well as others. It seems to be only "official dealers" (get their stock direct from Benchmade I think, not a 3rd party distributor) who have this policy. I am not sure if only official dealers are bound by the MAP, or if it's just coincidence that only official dealers get low enough prices that it is even an issue. I would imagine that legally only the official dealers could be held to it.
Other things have a MAP too (minimum advertised price), but it's not the kind of thing a manufacturer lists on consumer sites (if you knew the MAP, that almost ruins the whole thing because you know to keep shopping around for less). There was recently a big issue with CD's having something like that, and I think (don't recall for sure) they got into legal trouble because multiple production companies were accused of conspiring to agree on MAP prices.
