I know you said the Action Replay is a bit rich at $30, but honestly, it's the best import gaming adapter EVER to hit the Video Game Market (Retail wise, I don't count the Utopia Boot Disc for the Dreamcast, since it was free). For all the disc swapping, cart swapping and not to mention the wear and tear those methods put on your system, it's worth it.
I personally have a first-run Saturn that I soldered and put a switch on the side of, but I've had to replace the drive in it, as the first died from all the swapping back when the ST Key (action replay without memory) was all the rage.