Just buy the original IBM one then, those will probably outlive us, they are steel plated 1,5 kg monsters ;) There are differences between the models, so read up on that before you buy, I don't remember what to look out for, I think mine is from the late 80ies. (There are differences between the US and international versions as well)

I think I paid around 50 Euros or so on the German used marked for mine. And I love it!