You need to take a 12v test light and see how far the power makes it along from from the key to the solinoid.
There should be a big wire on the starter, coming straight from the battery that has batt voltage all the time.
Then a small wire from the key that has 12v only when the key is held in the crank position
If both of these have power, then the solinoid should be making a loud click as it drives the starter gear into the flywheel gear. No click with the power there likely means time for a solinoid. As for the rebuild price with that low of hours I can't see it needing a full rebuilt, but its possible.
There is a business called Borderland Rebuild up in Warroad, Mn that does most starter and alternators for me, usually while I wait 20 to 40 minutes.
Ron does good work and his price has always been fair. (218) 386-1471
I'd ship it there b4 I spent $330.00, regardless of where I lived, if its a delco and he does a full rebuild his price would likely be under $100
Can you post us a pic or two? If the test light test passes we may be able to descrive how to turn the main power studs on the solinoid, if the contacts are arcked off from too many starts. This can be done to most Delco starters with the solinoid right on the starter, and might get you by
Ken