The board is a simple 2 layer PCB, so any manufacturer should be able to do it 
E.g.: https://www.pcb-pool.com/ppuk/index.html

The full list of materials for each board:

1 x ADS1292R TQFP32 
http://www.digikey.com/product-detail/en/ADS1292RIPBSR/296-30389-1-ND/3188671

1 x Teensy 3.0 
https://www.pjrc.com/store/teensy3.html

2 x 14-Pins 2.54mm pitch 
https://www.pjrc.com/store/header_14x1.html

2 x 14-Socket 2.54mm pitch
https://www.pjrc.com/store/socket_14x1.html

1 x 2-Socket 2.54mm pitch 
https://www.pjrc.com/store/socket_12x1.html(can be split)

1 x 2-Pins 2.54mm pitch 
https://www.pjrc.com/store/header_12x1.html (can be split)

4 x Banana Socket 2mm
Dimensions specified here http://docs-europe.electrocomponents.com/webdocs/01b6/0900766b801b63e4.pdf

1 x microUSB cable

--Resistors (SMD)--
3 x 22.1K 0603
8 x 10k 0603
2 x 100k 0603
1 x 1M 0603

--Capacitors (SMD)--
6 x 47p 0603
3 x 4.7n 0603
2 x 1u 0603
1 x 0.1u 0603
1 x 10u 1206

--ECG electrodes--
4 x Leads with 2mm banana plugs
4 x Crocodile clips with 2mm banana plug sockets

--- Sensors ---
Assorted standard AgAgCl ECG electrode sensors

---- Test equipment ----
Optional: ECG phantom 
e.g.: the Muller & Sebastiani Elektronik GmbH | phantom 320 ECG Simulator
http://www.ms-gmbh.de/en/phantom_start.htm

IMPORTANT NOTE:
This system contains no isolation. It draws power from the microUSB port.
Never connect a mains-connected system to the board at the same time as
connecting it to a patient.