Cost here in South Africa is Rand 45/MB (about US$8/MB) which comes down to about Rand 22/MB (about US$ 3) if you go on a prepaid bundle.
Oddly enough, both networks (Vodacom and MTN) introduced GPRS at almost the exact same price, even though we're supposed to have a competitive market ... go figure!
In Finland we have these Pro Data phone contracts with Sonera. You can have 100mb traffic with 18 euros. Kinda good because the GPRS aint so much that you think. After 100mb its kinda expensive, don't really remember the numbers.