Yeah keep an eye out on fleabay for some good bargains, also on the for sale section on here. I just bought a KO servo off mr Skelding for £30.
I also bought a couple of Futaba low profile High speed metal geared ones of Ebay for about £30 each, and they've done 2 years worth of racing in the D4/Cat/Cyber.
When you think about what you've spent on the Acoms servos, you could have bought a decent one by now.
So worth keeping an eye out.
I used to buy cheap servos, but only buy good ones now. Its worth it in the long run.