If you're the kind of shopper who likes to occasionally check out the deep discount stores, full of dented-can foods and stock overruns, then this is the place for you. Consider: bins full of cheap-ass chewing gum and candy, never-heard-of brands of condiments and canned food, discontinued promotional-themed dry food staples. They also have bizarrely packaged frozen food that you'll otherwise never encounter, like food service/restaurant bulk bags of frozen soup.
I would keep a close eye on the expiration dates of things, or consider that it's better safe than sorry. I did buy some expired Famous Dave's Spice Rub, but figure I am safe with something dried and sealed like spices. They may have lost their potency somewhat, but at 50 cents a pop, I can always just use more.
I did buy a bag of pasta that was the most random collection of shapes and colors I've ever seen. It was called Wacky Mac and had spinach penne, beet wagon wheels, shells, macaroni and who-knows-what-else (Is that a pasta shape of Barney the Dinosaur?). The cooking instructions on the back must have been translated directly from Nepalese, since it intentionally misled me to overcook (and in Phoenix, we don't need high-altitude cooking directions). No big... it was still edible. And oh-so-wacky, as promised!
So check this place out just for fun. Their shopping carts have three different grocery store names on them (presumably now defunct), but the place is an adventure and your fellow shoppers all look wide-eyed and disoriented, like they have wandered into ancient unseen caverns. Call it supermarket spelunking!