B&H Photo Video offers the Sony 64GB Micro Vault USM-Q USB 3.0 Flash Drive (pictured), model no. USM64GQ/S, for $34.95 with free shipping ($0.55/GB). That's the lowest total price we could find by $10. It has a sliding "click" feature that protects your connector while not in use.

Of note, B&H Photo Video also offers the Sony 32GB Micro Vault USM-Q USB 3.0 Flash Drive, model no. USM32GQ/S, for $19.95 with free shipping ($0.62/GB). That's the lowest total price we could find by $8.