it came from an electronics store in Orlando:
Skycraft Parts & Surplus, Inc.
2245 W Fairbanks Ave Winter Park, FL 32789
That was the only unstripped box I saw but the place is like an episode of hoarders so you never know (and it did have some approriate sized holes pre-drilled). The only issue is that it doesn't have hinges, just screw down calmps on all four sides, so it will be a PITA to finishe the wiring.
I also bought T&J Electric 12x24x6 NEMA 4 locking encloser IN THE BOX for $34.95. They had about 4 more but none in boxes. There are HEAVY so shipping may reduce the cost advantage but and Central Florida Home Brewers should check it out.