Go to the Vintage Sewing Machine thread on quiltboard. Look for tutorials on how to clean and free up these old machines yourself. Easy to do since they were so simple. You learn a lot about how a sewing machine works. Then you just have to get new cord, etc., or convert it to treadle if you can find a cabinet and base that fit.
The Sphinx decals are fun! I still use my Grandmother's old treadle Singer redeye. Great for piecing, and some use for free motion quilting!