There are Perkins 103-10 23HP for $1695
Kubota, Yanmar Isuzu around $2400.
Not sure if this is bargain-pricing or not.

http://www.surpluscenter.com/sort.asp?UID=2004031617461139&catname=engines&keyw ord=NED1

Brian Whatcott Altus OK

None of these engines are marinized.. By the time you add a marine reverse
gear, water cooled manifold, heat exchanger (and the list goes on) the price
will double..

(not to say that Surplus Center doesn't have some good and worth while
equipment at very fair prices.)

Steve
s/v Good Intentions