Amazon has the LaCie itsaKey 4GB USB 2.0 Flash Drive for only $17.99, originally priced at $37.99. The “sturdy and resistant nickel surface treatment of the LaCie itsaKey makes it tough and dependable.” Product page.
Its lightweight and mobile form means it can go anywhere with you, and it�s backward compatible with USB 1.1, so you can use it with any computer.
[via Amazon]