SanDisk Ultra Fit CZ43 64GB USB 3.0 Low-Profile Flash Drive for $32.99. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for reference. It features high data transfer speed at up to 130MB/s. It is very compact and low-profile such that it can just stay put in the USB port. Most places have it for about $35.