I'm no expert...
But I think you'll find in most cases it varies greatly.
Based on condition and demand. Some times you get a good deal sometimes you pay too much.
If you look at previous auctions on ebay you'll see that the price for the same figure can vary from $1-$50
Just depends on the listing who else is after it. Where it might be located in the world.
There's plenty of online stores out there but they generally ask high prices.
Buy it now prices are generally high. Auctions are normally the best option IMO
At least you can pick your price and if you don't get it at least you know someone paid too much.
It's all about what your willing to spend verses what other people are looking to spend.
I doubt you going to find an exact price list though as there are too many variables to warrant such a list.