ebay. you can get basic ones with a drain at the bottom and a gauge to show how full it is for 30 or so from china/hong kong and some times the uk.
ok, by looking at the pic of my engine bay, where do I attach the pipes for the catch tank (feel free to edit the photo)
Sorry dude, i forgot about this... Anyways, on the second pic there is the black pipe that goes from a disc on top of the engine, to another disc on the inlet pipe, this is the breather and this is the pipe you need to cut, then attach exta pipe to and fit the catch can somewhere on an inner wing etc, so long as the pipe from the catch to the inlet goes uphill slightly you will be fine.