http://www.pcb-pool.com
http://www.pcb-value.co.uk
http://www.rak.co.uk
http://www.pcbtrain.com
adinfo at
agarcircuits.com
I can't comment on the quality of their services, I just happened to have
a magazine on the desk with their adverts in.
I've not used any of them, but a friend of mine who does electronic
design and prototyping has used PCBtrain and had no problems.
-tony