Like others have said, stainless isnt really good for a welding table. And not nearly thick enough if it came out of a restaurant. But for $150, if it looks like a good table, there are plenty of other uses for it, I am sure you can come up with something.
If it needs modified, you can weld it with what you have no problem. I do it all the time with my mig and standard wire, if I cannot find a piece of mild steel on my rack that would work, but have it in stainless. Just be aware that the weld wont be stainless