From what I remember looking at initial tablets in retail stores, most of the time they were not even functional, in marked contrast to Apple stores. I'm not sure how some retail places sell a single tablet.
Your right about stores not having functional models because there was a Asus windows 8 tablet with a screen defect at Office Max. But the reason why I was there was to buy a 32gig Nexus 7 2013 with a 20% coupon bringing the tablet down to $215. Not sure if Apple stores take coupons.
Ultimately does it really matter where you buy goods from if your saving money "legally"? If target knocked off $100 from a iPad 4 are you going to pay $500 at the Apple store when their not willing to price match? It's great that Apple now has their products at Walmart's, Bestbuy's and Target's but all Apple did was turn their stores into showrooms and repair centers with the occasional good deal on a refurb.
And here is the reason why people buy tablets at "some retail places"
https://slickdeals.net/deals/tablet/