LightInTheBox offers the SanDisk 32GB Ultra OTG microUSB / USB 3.0 Flash Drive for $13.49. Coupon code "SANDISKD2" cuts that to $9.49. With free shipping (choose "Postal Service - No Tracking" during checkout), that's a buck under our mention from two weeks ago and the best deal today by $3.
Note: This item ships from China and may take 11 to 18 business days to arrive. Uncheck "Add shipping insurance to your order" during checkout to remove the 49-cent fee.