Good luck, they are really hard to find used. And even when they show up, the prices aren't low enough to make it worthwhile in my book.
But if you are really interested, there is a used buckmark at Yeagers in Bellingham. Has a sight rail and a lower end holo red-dot on it already. Also has somewhat used wood "target-ish" grips that would probably clean up nice with some sandpaper and stain. It looks like an older version of the camper (i.e. doesn't have the "ears" on the slide) but unlike the current camper, it has a slab side barrel. I believe it was priced at ~$330 or so. They are currently gun-overstocked at Yeagers, so you might be able to haggle. I can take a photo of it the next time I'm in there if you are interested.
As for new, they are around, you just have to buy the one you see or call around to find the one you want. Worth it though. I love my camper and my father in law is picking his up later today. I still thank Roper for suggesting the buckmark to me when I was looking for a .22 (and thought I wanted the Walther P22).