Just had to buy one of these - at SuperCheap, about $44 (ouch). It helped solve my wheel bearing problem though.

THEN I stumbled on:
http://www.uxcell.com/mechanics-stethoscope-automotive-engine-diagnostic-tool...

This appears to be exactly the same device at $15.47 plus $7 postage. (Aussie dollars)

UXCELL are very reliable and fast and if you think you might need a stethoscope, this is the way to go! Takes 3-10 days for delivery. Pay using PayPal.
Dave

Thanks for the link. That sure beats using a screwdriver like I use to do.

Kev