Retailer Meijer has significantly dropped the price of the 16GB iPad 2 ahead of the rumored arrival of the next-generation model. AppleInsider reports that the big-box store’s weekly ad for February 12-18 touts the 16GB iPad with Wi-Fi as being priced at only $429—a $70 discount off the typical retail price—and notes that “all iPads [are] on sale”. The promotion is being offered on a “while supplies last”…