The knife used by Paul Hogan in Crocodile Dundee was custom crafted, but is almost identical to the German-made Kershaw bowie knife. 17 inches in length overall, with a 12 inch blade.
Price: $200-$400
Cheap Crododile Dundee replicas are available at various online outlets for as little as $20. However, if you want the real deal, a German-made Kershaw Bowie, these are hard to find, and your best bet is to search eBay.