My first "portable" band saw was a 100+lb. Delta 3-wheeled bench-top I chopped with 6" blue blade in a high speed polisher. I was lucky to live through the modification. I had to hoist it up to the beam but, once there, it was a charm and a treat to operate. Those old Deltas are hard to find any more but if you don't need that much throat depth you could use a two wheel. You just need a good blade transport system and a general purpose motor and a little American ingenuity. And lots of time to tinker. It would hold perpendicular better than rolling over a floor but ...it be cheap.