Bought it second-hand for $2, other 4 units for free. It's about $10-15 on eBay for a used one, which is still a very good price considering what you are getting for your money.
Indestructible, rubber dome, 4 KRO, PS/2, black, price like a bread roll. And indestructible, once again. IBM.
I use Cherry MX black switches because I don't like tactile feedback for gaming. Reds should be good too they are like black just lower resistance. I think stermy uses red switches?