Less than the best price I could find for 2 x 2gb cards:
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SanDisk Extreme III Compact Flash is designed exclusively for the high-end, professional photographers who work under extreme conditions and expect the very best in products and support services.
A minimum of 20MB/sec sequential write and read speed, which allows for faster capturing of large image files to the card, faster viewing of images and faster data transfer rates. *Based on SanDisk internal testing. 1 megabyte = 1 million bytes.
Features ESP Technology (Enhanced Super-Parallel Processing Technology), which provides best-in-class performance
SanDisk Extreme III Compact Flash cards are tested in extreme temperature ranges from -13 to +185 degrees Fahrenheit so that they can be used to shoot photos in any weather condition
SanDisk Extreme III CompactFlash cards are shock and vibration tested with industrial-grade RTV included, which is designed for rugged use
In addition, these cards are packaged with a mini-CD for data recovery software, RescuePRO, to recover photos that are accidentally deleted. A dedicated technical support line is available for our direct customers of SanDisk Extreme III products, and the support from this hotline will receive priority service. Lastly, these cards also include a travel case to help photographers keep their memory cards organised.