My ethnic experience isn't rooted in the middle eastern culture, but my fiancee's is, and she goes nuts in here buying some awesome, interesting, and delicious gear like tahini, chick peas, za'atar, feta, etc for making things like hummus, za'atar bread, and the like. I picked up a half-rack of lamb chops and a side of couscous for prepping ($12) together. Their butcher is awesome and far different from retail grocery chains in Phoenix. They have a mountain of hooves, FYI.
Typically, the prices are inexpensive-to-reasonable, but sometimes the rarer items are a bit elevated in price. That is totally understandable considering the unavailability of this type of product nearly anywhere else in the valley. They make you put at least $10 on your debit, so be aware, though they have so much good stuff that this fee is easy to surpass.