OK, this isn't cheap for a 4Gb USB drive, and come to think of it, I'm not sure it's a terribly good idea either...particularly for those that are free and loose with their change.
Still, it is at least novel...
With the new LaCie CurrenKey you can easily transfer and transport your important data. The inventive, appealing coin design is both eye-catching and practical, and the USB connector can be revealed by a simple twist. With the universal Hi-Speed USB 2.0 interface, the cross-platform LaCie CurrenKey can be used with all PC or Mac computers. Hi-Speed USB 2.0 not only offers universal compatibility and cross-platform convenience, but features hot-pluggable connection and high-speed transfer rates.
The metal die-cast construction of the LaCie CurrenKey makes it sturdy and dependable. Its backward compatible with USB 1.1, so you can use it with any computer. A product of the 5.5 Designers firm, the LaCie CurrenKey fits in your pocket, letting you take your data with you wherever you go. The third in a line of new collectible products produced in conjunction with 5.5 Designers, the stylish CurrenKey is a practical tool for your home or business, but its playful and inventive design differentiates it from other USB Flash drives on the market.