AT&T and Verizon Wireless have each announced that they will begin offering the iPad in their stores beginning on October 28. AT&T will offer all three models of the iPad Wi-Fi + 3G models at its more than 2,200 stores, while Verizon Wireless will offer the three iPad Wi-Fi models bundled with a Verizon MiFi 2200 Intelligent Mobile Hotspot for the same prices as the equivalent iPad Wi-Fi + 3G models: $629 for a 16GB unit, $729 for 32GB models,…