I bought my Featherweight on eBay, and I also bought a couple others for friends on eBay. I really love my little workhorse. It keeps sewing, and sewing, and sewing. All you need to do is keep it cleaned and oiled. I have copied my little manual so that I have it in electronic format if something should happen to my original. There are alot of places to oil that you would not think about, and that manual shows where very clearly. Just oiling the bobbin case isn't enough. I go to quilt meetings frequently and taking my Featherweight keeps my other machines safe at home. The FW is easy to tote around and it has a consistent, nice stitch. It has been very reliable for me. I have several friends with Featherweights and my husband has held a maintenance workshop for the group to teach them how to keep their machine working smoothly.
I think that many Featherweights were forgotten for a long time, so being stored for an extended time in sometimes out of the way places can cause them to acquire a musty smell. I think they were rediscovered in the last few years and people are digging them out realizing they are worth something. If you want something lightweight that does fancier stitching, I challenge you to store it for 50 years and see if it can be brought back to life. Unless the machine has been badly abused, you can't buy a hardier little workhorse.
I think you can buy a Featherweight on eBay for around $300 or a little more... I actually got one for $150 for a friend and the only bad thing was her case wasn't in very good shape. You might not want to buy one from someone who has no history to look at.