Guntrader is a very good site if you have a shopping list in mind, and a budget.
Take a look on there and then ask around your club etc, and here, to see if it looks like a good price. You obviously need to look at the gun before you buy, but you may be able to get it transferred to a local dealer so you can inspect it (they will however charge you the costs incurred).
I bought my rifle in that manner and my girlfriend sold 2 of hers like that, using a local dealer as middleman.
Rob.