If i remember correctly, HIS was really one of the last companies to continue making AGP cards using newer chipsets. Still, post-modern AGP cards are pretty expensive these days.
For the price of a new one you can probably end up getting yourself a second hand rig that supports pci-x and ddr2. I built up an AMD X2 AM2 rig for mame a few months ago and it all cost me less than 60 dollars for a second hand mobo, CPU, GPU and ram.