I just grabbed an iPad Air 2 Silver Wifi Only 64GB for $499 (before tax) on bestbuy.com. I am about to pick up it at my local bestbuy store. It will be a christmas gift for my youngest sister. I have had an Air 2 Gold 64 GB Cellular for the last month, and it is perfect.
Updated: I decided to return my 21 day-old iPad Air 2 Gold Cellular 64GB, and I use the amount of return credit to buy an iPhone 6 Space-Grey 16 GB T-mobile + leather case. Besides, I was also fortunate to grab an iPad Air 2 Gold Cellular 128 GB for $729.99 on bestbuy.com. In the end, I just ended in an iPad Air 2 Gold Cellular 128 GB (the same cost as my 64 GB one) and an iPhone 6 Space-Grey 16GB T-mobile Unlocked