Ok, I was looking at Leviton's products, but while they appear to be the most consumer-friendly, their prices definitely aren't. The actual boxes aren't unreasonable (I was considering a $122 model that was 30" high with a hinged door), but the accessories are absurdly expensive. We're talking about 4"x6" plastic brackets for $38 and 20 plastic replacement pegs for $10.

Now I'm looking at boxes from some company called OpenHome. They're not as pretty but they're reasonable, I think.