There's probably lots of those sitting around that people aren't using.
A few years I put an ad on eBay saying I was looking for a specific synth module. It was free to do that, and I ended up having a guy contacting me and bought the unit for cheap.
You might see if eBay still offers that, or even run an ad on your local Craigslist saying you're looking for SX. There's people out there who would gladly sell you that program for cheap, it's just locating them.