Here's a cost breakdown for this bad boy, but I got the thermostat and freezer for free:
Keezer
Perlick Taps $100
Regular Tap, regulator, startup kit $90
15# co2 tank $110
tubing $20
Ball Locks $20
Clamps $5
Secondary Regulator $40
Total For Keezer $385
Yeah...my penmanship...