What you need is to find an old cheap 386 or 486 at a yard sale or flea market. Then get a few network cards and load up a floppy based firewall software, like FREESCO or linux router project. That's probably more time than you want to spend though. So you have to decide if spending a little more on a router is worth it.
I built my linux router project router for $50. Although I have probably spent at least 40 hours tweaking and configuring it. Granted most of that time was moding it to contain no moving parts.
Check the FS/FT forum. I picked up a 4 port linksys router that has been great for me for a little more than that. You may be able to pick up the single port version for around what you want to pay.
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