400?....you're going to have to do some serious scrounging and shopping, to keep it around that for a kegorator.
I stopped tallying mine up after I broke the thousand dollar ceiling. including the $180 for my 7 cu chest freezer. It's got 3 taps though it can hold 5 kegs. I bought 4 kegs for about $140, Spent about $360 on on the co2 tank and regulator, and all the stuff necessary for the gas and liquid lines (including tap hardware and lines,) I spent about $160 for a secondary regulator. $30 for my Ebay Temp controller. Everything else was lumber, stain, insulation, sealer, silicone, and all the miscellaneous hardware and crap from home depot and harbor freight, including the electrical stuff for the temp controller..
I also ended up buying an orbital sander and a saws-all.
I spent $44 on a 12" drip tray, and another $30 for a nice old time bottle opener and cap catcher for decoration.
It came out to be much more than I expected, but it's sweet.