This is cpoied and pasted from another post of mine but it should help...
Mine was $200 and came with a 2slot mobo, last resort, and street slam. BUT! It needed work to get working well (replace joys and buttons, and tweak monitor [that was the hardest part, all the little knobs doing every little thing and not to mention how sensitive they are]). Also, the guy selling it didn't really know what it was worth. You can probably pick up a working, dedicated 2-slot for like $435. Mine was probably cheaper than that also because mine is known as a "converted" cabinet, which is when someone converts it to work with another game than it was originally intended for (which unfortunately was Omega Race, supposedly really rare!). If you can find a not-so-good condition cabinet, it might be fixable. Virtually every problem is fixable, but they vary in how much they will cost. If the monitor is in terrible shape and will barely give a picture than a new 25" one will porbably run about $350 (my guess). If it's something like chipped paint, damaged monitor plexiglass, damaged coin mechs, damaged buttons/joys, or something cosmetic it generally will not cost a whole lot to fix.