Simpleman, I was tired of using calling cards. Although they offered great rates.. after some unsuccessful attempts (w/charge) and the connection fee... it used to be expensive at the end..
Now I am using Hello977 (www.hello977.com). Quality is good and it's cheaper. 6cents/min for kathmandu and 10-11 c/min for mobile or outside ktm.
So far that's the only one site I have found useful. If you find anything better than that... please share here.

Guchcha Chor