50 1.4's Takumars (all varieties) are some sort of cult now, so have somewhat higher asking prices on eBay, and seem to bring a decent prices in open auctions. Still, they really aren't a bad deal around $50 or a bit more. They were standard on Spotmatics, so are actually very common, and show up cheap locally when sold on a camera. 35/3.5's Super Multi Coated can be had very cheaply and are really nice lenses. The 35 f2 goes for more, but can still be found well under $100 if you hunt around. That is my favorite lens in the system; it's a nice lens and helps with the finder brightness and focusing too. 105's show up at times either side of $100. 24 and wider, 85, and fast lenses in general seem to bring substantially higher prices.