• www.call-store.com - Best Rates from New York To Moscow (and Russia)
This is what I use.
Western Express Calling Cards - 212-736-7465 (or -7367)
Access numbers:
  516-479-0202, 212-835-5603, 212-835-5605

• Cognigen - Immediate and very easy detailed rate analysis for all of our long distance carriers - side by side - in your area. Just enter your phone and where you want to call - and get list of options sorted by price.