Yesterday, I noticed one keyboard for 99 cents in a thrift shop, and the keys seemed to have a nice feel, as well as being made of glossy ABS plastic, so I bought it. It turned out to be a rubber cone keyboard, but at least with individual cones for the keys, like a Keytronics, but with a crisper feel. (Strangely enough, though, the back of the keyboard internals clips on to a curved metal plate, giving much the same appearance as a Model M; the plastic case strongly resembles it as well.) This keyboard was made by the Japanese company Mitsumi.
Today, I visited another part of town with two thrift shops next to one another. I bought an Apple Keyboard II in one, thinking to find ALPS switches in it, but I see it uses another type of switch entirely. (The stem is round, there is a thin spring in it, and the assembly seems to be one piece of plastic for all the keys, like some membrane keyboards; I'll need to look up what that keyboard used.) There were also two other keyboards for Macintoshes, one by Apple, and one by a third party, with numeric keypads and function keys, but they had no tactile feel at all, so I ignored them.
At the one next door, I bought a keyboard with the same 101-key but AT-style layout that I hated and still hate (backspace key in the wrong place) as the 99-cent keyboard that I bought yesterday. It set me back all of two dollars. It didn't seem to have much tactile feel, but I thought being an early keyboard it might be useful in some way. It was made in Taiwan.
The model number is 1KB101, although on the label in blue there are the much larger letters 1HB101. No manufacturer seems indicated.
A very pleasant surprise when I opened it up and took off some keycaps.
Double-shot molded keys. Cherry-style keyswitches (blue stems).
EDIT: I found a site with pictures of the key mechanism for the Apple Keyboard II, but it's in Korean. And from their pictures, apparently some keys do have ALPS mechanisms.
http://rasoyuz.tistory.com/51