Hi Nick
I have never tried to ordered a stencil. But I believe that the Gerber Files for it, which can be downloaded from the
Hedghog web page contains all the information required.
I checked on PCBWay.com and when ordered with PCB's a stencil that would do both sides would cost about US $ 22 extra. This includes the extra postage.
Or purchased on it's own costs US $ 36 including postage to Ireland.
Frank