Timely post. I was just at the HP website earlier this week looking for a replacement for my HP 11C, which I bought new in 1987. About five years or so later, my Pop gave me a spare 11C that he had lying around at work. I have one at work, and one at home, but the work one is on it's last legs (machine shop environment has taken its toll.)
Seems they don't make any of the horizontal layout scientific calculators any more, but they still make the financial version. As an engineer, this doesn't help me much. I checked ebay, and they seem to be going for $3-400. Sorry, but $3-400 buys a lot of Porsche goodies.
So, I'm still on the hunt. (I'm too stupid to use a standard calculator)
An interesting web page if you're a dork like me
http://www.vcalc.net/hp.htm