Ordered a new radiator from Yokohama Motors last week and it came in yesterday. With shipping and taxes it was around $260. The old one has been leaking for more than a year and I've just been adding coolant but it got a lot worse this winter while I was plowing snow.
Yes the fins have been falling out for a couple of years. The dark spots on the lower left side tubes are where it was leaking.
I'm sure you've seen my thread from about 3 years ago when I changed my radiator, but here is a link to it for reference anyway. http://minitrucktalk.com/threads/radiator-removal-and-repair-replacement.13803/#post-81422