I've done the price-match for flourite/Tahitian moon sand at my local petsmart. I've also matched on a python system and some other things. I have been matched by both of the managers here at my local store. It all depends on the manager from what I can tell. I sat down with my local petsmart managers, explained to them that I realize they have a huge markup, and that if they wanted any of my cash they match or I go elsewhere. They wanted the cash so they match me on anything I bring in. I only use petsmart though when I'm in a jam (need something immediately). Of course when you can get flourite for $10 a bag and not pay shipping, I use them for that too, heh.
Matt
Matt