how much would you pay for a 2'x4' solar panel that puts out 24 volts and 74 watts?
That's a rather low power for that size. Is it an old panel? Is it amorphous silicon, or crystalline? That should easily fetch $ per watt on craigslist. If I was buying a panel myself, I would probably get a more mainstream panel from a major internet vendor.
It all depends on where you live and who you get them installed by.