I have that in stock in the UK, but I don't think that would help you much. I have a feeling that UK and US back boxes are incompatible for a start - though I could also send you a box as well if you want.

Let me know if you're interested.

[edit] Btw, I do a couple of different grid systems (MK Grid Plus and Scolmore Click) and between them you can make up virtually any imaginable combination of switches, neons, keyswitches, fuse carriers, dimmers, buzzers, tv outlets etc on a plate.