Thank you all for responses! Didn't expect such a large feedback
"Membrane" is actually only the actuation mechanism. Some mechanical keyboards, like the IBM Model M have membranes in the bottom under the mechanism that provides key resistance. You mean "rubber dome".
Yes, rubber dome, thanks
Couldn't remember how it's called.
SSK2 should be far from impossible to buy. They pop up on ebay pretty often. At one time I was considering buying one for $38 (I think it was $52 shipped). They are quite popular with people I know - should be one of the more reputable rubber dome models around.
Yes, I've bought on not so long ago for 45$ shipped (I need one more keyboard for work, this one I'll keep at home), the problem is that a lot of the sellers ask for unrealistic prices, 100$+. And it's much harder to get one in Europe, I'm in US now, but in a couple of months I'm heading home.
For the suggestions, Topre is way to pricey for me, and microsoft is more chiclet style and bluetooth. I've actually been using the microsoft mobile bluetooth 6000 and it's awesome for me, but bluetooth. I just hate bluetooth keyboards.
The Kinesis Freestyle 2 looks pretty interesting. I think I'll look on ebay for another SSK2 (currently there's one for 60$ shipped at auction, kinda pricey but.. ) or the Freestyle2.
Anyone used the Kinesis Freestyle2?