What happened to the straight tube 2.5-10? They were in the Nightforce catalog last year and even listed in the current Midway USA catalog, but I can't find one anywhere. Have they been discontinued? Does anybody know where I might find one?

It is still listed on their web page. Try this link to one of their online dealers.
http://nightforceoptics.com/ni.../dealer_locator.html

I can find the 2.5-10x32 everywhere, but it is the 2.5-10x24 that I am looking for.

Nightforce has discontinued making the 2.5-10x24. We do have still available if you are interested.

http://www.theopticzone.com/de...o&opt=detail&id=3050