Put me down for 20 + accessories.
Interested in up to 50 pcs depending on your final price (when possible including micro usb and power cables).
The miners use miniUSB not microUSB cable
How many miners can 1 controller board handle in total? I have a 49-port hub ready for mining.
The controller is a slim linux box, which spawn a minerd instance for every miner detected, so I'm pretty sure 15 per controller is not a maximum. CPU load may be a limiting factor.