Even though the new Google Nexus 7 wasn't expected to be released until July 30th, a variety of retailers started selling the refreshed slates on Friday and buyers were obviously prepared; at Staples, which offered a $30 discount with a coupon code, both the 16GB and 32GB models are now out of stock. At Amazon, not only is the 32GB variant sold out, orders placed for the tablet now with the online retailer won't ship for 3 to 4 weeks...
Source: http://www.phonearena.com/news/Google-Nexus-7-already-sold-out-at-Staples-with-32GB-model-now-on-3-to-4-week-back-order-at-Amazon_id45771
Source: http://www.phonearena.com/news/Google-Nexus-7-already-sold-out-at-Staples-with-32GB-model-now-on-3-to-4-week-back-order-at-Amazon_id45771