The Saturn is a lot harder to get than the Dreamcast.
I've done a few Saturn mods, it's very very simple. Swap a ribbon cable and two solder points, one for +5v to the mod PCB and the other usually just connecting two points on the PCB. Takes 5 minutes.
You have to be sure it's a Model 2 Saturn, though. The Model 1 is much harder and the modchips are pretty much no longer out there. I'd say $20-25 is good for a strong unmodded Saturn and $60-75 for a modded one. The modchip itself comes to $25-30 after shipping.
I'd be willing to do a couple if people mailed them to me. No charge, just get the chip, mail it to me with the Saturn, along with fundage for return shipping. I could tell you where to get the chip, too.