when i was looking around at petsmart, i heard these two kids talking.
one said that he bought a filter at the store but pricematched it with the online store and saved over 50$ or so. He then said he returned it without the receipt, and they gave him store credit of the store price, which was 50$ more, so he pretty much made 50$. Then... he said he waited a couple days and came back and bought the filter again at the online price, and he had an extra 50$ to spend...
it seems from what you guys are saying, that this can happen.
I think its pretty sad though, first that people would do such a thing, and that the store can't control their merchandise