$200 for a Radeon 9000 Pro is a rip-off IMO, although I don't know much about prices for Mac-specific hardware. My sister got a Radeon 8500LE (250/275) 64MB (PC version) for her birthday a few weeks ago. It cost less than $100 and is better than the 9000 Pro. I live in Sweden and it should be possible to get the card cheaper in countries with lower sales tax than Sweden (25%).
/Martin