That Delta SS350 is a really decent scroll saw for a 16" bench top. I picked one up off Craigslist a couple of years ago for 150 bucks, but it was new in the box, so I felt it was worth it. The Quick Set II blade chucks on them are no longer available as a complete assembly, although you can still currently buy replacement jaws and a couple of the other individual parts for them if needed.
The screw pins in the rear that connect the link to the upper and lower arms are prone to wear and the owner's manual says to use sewing machine or 3in1 oil for lube, but that thin stuff just seemed to get flung off and make a mess as well as collect sawdust, so I removed the left side of the saw's housing and cleaned everything up, then lubed all the wear points with the Superlube silicone oil in the pinpoint applicator instead, which is thicker and clings much better. It runs smooth as silk. Enjoy the new saw.