Coin Values

I use all of the above and especially my own opinion and the amount I am willing to pay.

Madspec

As I know nothing about American coin values and pricing, I just find it odd that no one has made mention of Krause's Calalogue of World Coins.
I know that in relation to Australian coin values, their prices are almost completely out of whack. All values quoted are generally too low, sometimes as much as 70-80%.
Does anyone have any comments on countrys' other than Oz or USA.
As for a reference, I use th same book as snooba.
regards,

I checked PCGS only because it is the easiest and fastest to reference. I use their price times 65-70% for bidding purposes on PCGS coins. On NGC coins I use numismedia values. I also use teletrade for a reference as well as heritage on occasion. I think legend auctions are very user friendly also. They post the grey sheet bid/ask price as well as Coin Universe and what they expect the auction to bring. They are fairly new so the past auction prices are not complete thus not reliable yet.

ebay b/c a coin is worth only what another person is willing to pay for it!