http://www.ebay.com.au/itm/Orienteen...item43a6373e3c
Brought three of these, at $2.50 a pop you cant go wrong!
They work well, so long as they are not too close to metal and must be held level (close to, it has some play) or else the needle hits.
Not the best, but gets me to true south roughly and then i drift align from there - its normally not very far out.