Expensive! Mine came from the usual route (mil-surpus from Anchor)
You can improvise though. The screwdriver in the ear is effective, if inconvenient in layout. You can make all sorts of lashups with two tincans and a length of string, then work up from there.
I really don't want the possibility of the handle whacking me in the ear when working on cars. My cheap medical stethoscope works fine for finding car noises.
A non-conductive length of plastic knitting needle (obtained for 20p from GoodCausesRUs on your local high street) glued to the bottom of a yoghurt pot might be more comfortable to use, particularly for Mr Plowman who apparently, and understandably, doesn't want to enlarge his ear canal to the diameter of a screwdriver handle.
Owain
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