Team X101 64GB USB3.0 Flash Drive for $41.50 with code EMCXRXL24 (65¢/GB).
When plugged in to a USB3.0 interface (USB3.0 ports are usually blue in color), it can read and write at 70 to 120 MBytes/sec, meaning it can take only about 15 minutes to fill the entire 64GB, as opposed to 45+ minutes on a standard USB port.
Verify the shipping method during checkout, since the cheapest shipping may not be the default selection.
Above fees do factor in the $1 shipping fee on some.
If you have a Shoprunner account, shipping is free and will save you a dollar on some.