Amazon hasn't sold current iPad devices (and many other Apple items) for a few years now. However, times have changed...tablet sales have been declining for years and more importantly, I think Apple needs Amazon more than Amazon needs Apple.
The massive online presence (especially the exponential growth the past 3-4 years) that Amazon has must be hurting Apple iOS sales simply due to lack of Prime-ready, Apple products. When I have gone in the past to look for an iPad on Amazon, it's been search result hell...old models not clearly labeled as old, used iPads, sold by 3rd party sellers, etc. Considering that Amazon is the first place people search for a product (yes, even before Google), I think this confusion is hurting Apple iPad sales. Apple currently has to rely on Target, Best Buy, Walmart, and Apple.com as its main iPad outlet. People are sick of paying 100% full price so they don't shop for current iPads on Apple.com. The remaining 3 are okay, but their online return policy is nowhere near as simple as Amazon, their shipping (on various levels) can't match Amazon, and their customer service is FAR WORSE than Amazon.
My guess is Apple is really hurting from the lack of Amazon (world's largest online retailer and now entering the brick and mortar space) iPad sales. Apple needs to swallow its pride and play nice for a change.
Time will tell if Amazon will have great iPad pricing (Best Buy ran an early-black-Friday promo this past weekend where all iPad 128GB models were $100 off! I ordered one!) or if it will be just match the other online folks. Target just announced $249 32GB models on Black Friday...will Amazon have the iPads in time for Black Friday? If so, and if the pricing is close enough to Target, I will buy from Amazon (I'm in the market for a few 32GB iPads).