Thanks to 4me2save for the code:
"Use code NETWORKING10 to get a further 10% off making this £22.48"
Seems like a decent price for 2 1000 Mbps units. I think there have been similar and better deals in the past, but it's the best I can find right now. It's just what we need.
If you are new to these, don't make the mistakes I made: they need to go straight into a wall socket, so it can be worth paying the premium for the ones that come with a pass-through power socket.
Also, for a lot of uses you don't necessarily need masses of bandwidth. 1000 Mbps might be overkill.