The trouble with buying off of an auction site is: a) Many of the sellers are dealers, pawn shops, etc. and they have a reserve (minimum acceptable price) that they will accept which is usually the average retail price. b) Also even if you find a bargain the shipping cost, and transfer fees can quickly eat up any savings. c) You can't inspect the goods before buying. You can't tell that a barrel crown is dinged or if an action is loose from a grainy picture on your computer screen.
That said, if you have a lot of time to kill and constantly search the auction sites you can turn up a bargain once in a while. I picked up a like new, 2 year old, Handi in .280 Rem. off of gunbroker.com for $195 including shipping & transfer fees. But I searched a long time before I found it.
Helpful hint - All of the auction sites have a rating system for the sellers with a history on that site. See what others have too say about a seller you are thinking about dealing with.
Good Luck.