I just bought a pair of poles on eBay. They were sold as "ski walking" poles. $69. Not collapsible. 130cm, I think (yes, I am that tall). Made by SWIX in Norway.

The seller was real nice, he even threw in an extra set of rubber tips for free after he had to tell me he didn't have the carbon fiber versions I originally ordered (carbon fiber poles were $79).

If you google "ski walking" his site is the first hit. So far, I like them a lot, but I haven't done any serious hiking with them.