**SAVE $50: **The new 13-inch Apple iPad Air (M4, WiFi, 128GB) is on sale for $749 at Amazon, Best Buy, and Walmart as of mid-March. That's $50 off its usual MSRP of $799; it's never been cheaper. Apple iPad Air, 13-inch (M4, WiFi, 128GB) $749 at Amazon $799 Save $50 Get Deal at Amazon Get Deal at Walmart Get Deal at Best Buy Amazon, Best Buy, and Walmart are celebrating the release of Apple's latest tablet with a decent launch day deal. As of March 11 — its first day on the market — the new 13-inch iPad Air with the M4 chip is $50 off at all three retailers. The base configuration with 128GB of storage is now just $749 (normally $799), which is its lowest price yet. This is the first time the new 13-inch iPad Air has been on sale, but its 11-inch counterpart was marked down to $559 (or $40 off) during its preorder phase. Blessedly, that discount was still live at the time of writing. The two tablets are identical aside from their screen sizes and brightness.…