Walmart has announced that it will be dropping the price of the 16GB fourth-generation Wi-Fi iPad to $399, and offering a 16GB iPhone 5 for $127, effective today, substantial price cuts that are surprising at this early stage of both products’ availability. Additionally, the fourth-generation iPad will also come with a $30 iTunes gift card starting on Monday. The 16GB iPhone 4S has also seen its price cut today to $47 — both iPhone price cuts…