Haha, most of them are on the cheap. You should be able to get all of their lenses for less than a hundred, definitely less than a hundred and fifty, if you're patient. There's an 18mm, an 18mm pan focus (which is unnecessary because the 18mm is practically always in focus anyway), a 20-40mm push/pull zoom, a 24mm, a 50mm and a 70mm. The regular adapters run about 20 dollars each but the lenses do not have apertures because it was built into the cameras. I used step up rings and fader nd filters to darken the image. Kevin informed us of the existence of an adapter with a built in aperture, from RJ camera, it costs 75 bucks, but I read from their site that the adapter won't work with 70mm. So with adapters you could easily get the entire set for 200, 250. If you read the reviews, and I will confirm... The best lenses of the lot are the 18mm and the 50mm. You can probably get both of them for less than 50. In fact, I think there's an 18mm on eBay now for $18 or best offer plus shipping... Which is a great price. I'd still pick up the 24mm, it's a decent little lens, little being the key word... This thing is tiny... They all are. Also, you will probably need some kind of lens focus lever, if you pull focus. I have one of those silicone bottle cap openers that were popular a few years back, but a zip tie would probably work as well. Sorry for the long winded answer. Just search Pentax 110 lenses. Or more specific Pentax 110 18mm, Pentax 110 24mm... Etc.