Website for Zeni keys:
ZENI | Cylinder Keys | www.keytrader.co.uk
I bought some of the Dominion keys at a reasonable price in the states. I picked up 10 for about USD 20. They were about $6 ea and I figured I should get 3. So, might as well get 10 for a couple extra dollars. That would give me a cushion for when they screw up a blank at the hardware store.
I don't have the name of the company at hand. I just searched on Dominion along with key number. Two or three companies came up.