There are so many variables that are not being accounted for though. For example, what size round are you looking for? What type of firing mech? Metal or poly? New or used? I could go on for awhile, but long story short, certain features/attributes will cost more than others.
Assuming you are looking for one of the "big 3", there are quite a few to choose from. If you don't know this already, that is a very very common price range for most people.
All I can tell you, just from personal experience, avoid Taurus, Bertha, Hi Point and any other deal that may seem too good to be true (because 9 times out of 10 it is).
Let us know more about what you're looking for so we could better assist you.