Here seems to work, but it's a shareware version, I hope you'll be able to get a license.
http://www.tucows.com/preview/296101?id=296101
Edit: no...server down...did you try with e-bay?
I've searched on about 15 sites...nothing...nothing and nothing...only Joe & Mac Caveman ninja and some Nes games...
Himo we are talking about an abandonware game (not really sure), but it's impossible to find a link where you can buy it and Rockland Software doesn't exit anymore...there's only a shareware version around, maybe someone has a copy at home.