Here's my report. I bought the overlock with a MILLION cones of thread, binding tape and some other doodads for $150. More than I wanted to pay, but it was early in the day and that's what happens.
The industrial serger was going for $240. While the machine on top wasn't huge, the table and motor underneath are all metal and massive. Extremely heavy. The sale lady offered to deliver it, but I declined. I think it would fall right through the floor of my little seaside cottage!