Sometimes you find good deals. I got a BOGO deal at Midwest over the holidays. Used ball locks were $50, so $25 each (limit 2). But you had to spend $100 in the store to get the deal, which I was going to do anyway.
But in general they are very hard to find for good deals anymore. I have 4 and need 6 or 7 long term.
Primary #1: Empty #2: Empty
Secondary #1: Belgian Golden Strong #2: Dark Belgian Strong #3: Empty #4: Framboise Lambic
Kegged: RedHook ESB clone, Fat Tire Amber
Bottles: Surly Furious clone, Kicked by a Moose Scotch Ale, Apfelwein, Russian Imperial Stout, Trappist Dubbel, Carmelite Tripel
On Deck: Kölsch IV, Altbier II