I have two hot water solar panels, they are made by Radco products Inc, Model 408P-HP and have a 32.28 Sq. Ft. of surface area each (46 x 101.5 inches). They are about 15 years old. The sealing caulk for the glass is dried up, but it appears I could remove the the tops of them easily enough clean and reseal them with new caulk.  Any thoughts. I was hoping they be worth about $400 each, sicne new panels are well over $1,000.
 

A couple of these on Craigslist for $300 http://southjersey.craigslist.org/mat/775999790.html

I've been buying panels and watching prices.  Basically, they seem to go from about $150 to about $400.  This doesn't seem to depend as much on the quality as on the availability (which these had been available when I bought mine).

You might try pressure testing them, since used panels are always a risky purchase if you don't know if they leak.

You might also explain what you've run through them since I hear that glycol will degrade the panels.

Removing and re-caulking the glazing is not difficult, but it is long and tedious.

What's wrong with the folks in New Jersey that the don't want solar panels? 

The glass should sell on CraigsList - it's probably tempered, someone must have a solar project in mind.  Or maybe you could build one of these Solar Air Heater with it.