Hi Don - I've seen the listing for that saw and it does look to be in nice shape. $130 seems reasonable, but others have pointed out some possible issues with arbor size/blade compatibility, and safety features. There's also the smaller table size, lack of ability to upgrade the saw, and possible problems with parts. Vintage tools pose some special needs that many of us aren't all that familiar with...there's a website dedicated to older tools
that might be useful if you decide to pursue it.
I typically recommend that folks go for a standard full size saw with a belt drive induction motor like a contractor saw or hybrid. The vast majority are 10" saws with standard 5/8" arbors, 27" deep tables, and 1-2hp induction motors. Many parts like motors, wings, fences, miter gauges, miter slot accessories are interchangeable, so upgrades and repairs are feasible. $130 isn't a huge budget, and it isn't likely to find a saw that's in as good shape as the Rockwell, but it can get something that's a standard full size, functional, and has potential if you're willing to put in a little elbow grease. Most just cleanup and setup to perform well.
Saws like these are what I mean. It can take some patience to meet budget, but they do come up from time to time. It also doesn't hurt to offer a more reasonable price on some of the dirty/rusty saws that are on the Rochester CL right now.
This one is pretty rusty, but with some effort should clean up to look like those above.
p.s. No need for duplicate posts...you can edit the original if you'd like to add more info to it.