Re: Siezed motor? possibly?
I haven't tried them myself, but several have said they have had good luck with
D&B Electrical. They have a marine starter for $58.
I bought this starter at the beginning of this season. Works just fine but doesn't come with any shims so keep the ones removed from the old one. The only issue I have found is the bolts broke off in the block after several starts (might of over torqued?) and if your on the coast it doesn't seem to be galvanized materiel. I would definitely recommend! I also bought from DB Electrical, shipped super fast and well packed.
To dig a little further into your starting issues... is your "clunk" a solenoid providing the audible "click" when the key is turned but the starter is not actuating? Or is the solenoid actuating the starter and your "clunk" is from the starter hitting the fly wheel but not turning the engine over? The difference could be the starter could test fine on the bench but not providing enough to turn the engine over or there is a short, bad solenoid, or the circuit breaker not providing the voltage to the starter. I would ensure the leads and wires are in decent shape, ensure the circuit breaker is not damaged or popped, and then take the started off and wedge a screw driver in to turn the fly wheel to make sure there isn't an extreme amount of force needed to turn it over.
-Joe