Harley Benton powerplant PSUs are good and cheap.
The ISO-5 will power 5 pedals (more with daisy chains), has 12V and (I think) 18V options, is fully isolated, fits under a PT Nano/Nano+ and costs £42.
The only downside is the euro/adapter wall wart... myvolts sell a decent upgrade but that's another £15 or so.
Voodoo Lab and Cioks are good and not cheap!
It's worth investing in a decent PSU... they're not as glamorous or exciting as another pedal, but well worth having IMHO.
Get one with more outputs than you currently need, you WILL be buying more pedals!