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Kingston (who I never knew made CF cards) has a 4GB CompactFlash card for $24 at NewEgg. At 8MB writes and 10MB reads, it’s hardly blazing, but if you don’t do any high-volume activity, it’s not a bad deal.
Actually, if you’re not looking for speed or name brands…
They seem better-suited for a ultra-low-power PC than a camera, of course: no one needs a 32GB CF card, and the type of people that would ‘need’ one are the type of people that couldn’t put up with anything but the highest throughput available.