RO-man aren't bad for but you might have to wait for them... 
Tell me about it!! Ten weeks for a filter housing!
Im a wcw regular and normalyy get stuff next day, I know from my mates that other suppliers are just as reliable, but the blokes there have sorted me out a few times so I stick with them. Think they stock sureflow, flojet and aquatech, which btw is the best pump in the world! haha