depends on condition/cosmetics. Good working order, decent (no dents) cosmetics, maybe $150 or so, depending. They have a cachet, although not as quick to use as an Olympus XA because of no rangefinder.
It is one of those items on ebay that fluctuates in price. In the large scheme of things they are never all that expensive. People like to get between 225 and 300 USD for them. I bought one off ebay a few years ago that I felt I got a good deal at 200 and it looked good and the lens was pristine and the meter worked. However when I got it the shutter wasn't working right. As it was good in every other way and the lens was perfect I sent it to Krikor and had it fixed and it works perfectly to this day... though I really never use it and treat it as a novelty. I see there are quite a lot of them for sale on ebay. If you are worried about 50 dollars one way or the other then wait for a low minimum bid with no reserve and hope it doesn't need a CLA.
I have a 35SE that I bought new in the early 80's. I would guess it is worth about $100, but I would not sell it. It has been with me on most of my trips and given me some great photos, some of them posted here. It is a bit hard to use until you learn to guess the focus, and requires a service now and then. They do wear out though, mine is nearing the end of its life. The negative spacing is a little uneven now due to worn gears, but I will use it until it dies.
If you can get a nice 35S for about the same I would do it. I think you will be happy.