Viking 512MB 33X Secure Digital Card $28.99

Viking InterWorks' SD cards can be used in any device that requires the robust security features that this standard offers. The SD form factor represents the smallest,secure flash memory card in the consumer market today and is flexible for applications ranging from MP3 players to PDAs to digital cameras. Combined with low power draw and the highest capacities available, Viking SD cards are the best option available for taking your digital files with you anywhere.

Buy.com is carrying this 512MB Secure Digital Card for $28.99