Spectrum analyzer for 5 Ghz band

Has anybody used any spectrum analyzer capable of view 5 Ghz band?
I mean something like that http://www.wi-fiplanet.com/reviews/article.php/3651326
Does anybody know something cheaper?

Thanks
Massimo

http://www.ubnt.com/airview/

They are supposed to be coming out with a 5Ghz one at some point, not sure when though.

Here is one from Wisp-router.com

http://store.wisp-router.com/itemdesc.a … Bx&eq=&Tp=