Where can I find a value of old amps


I picked up a pair of Marantz model 2 monoblocks from a estate sale. What is the resale value? I usually could find other units for sale on ebay or forums like this to get a idea of what to ask. I can't find much about these on line.

If you could point me towards a link that would help me

Thanks Joe
ssccooppee0f63
Here's a listing with price information that suggests a price range of $1580 to $2250 (each? per pair?) obviously depending on condition, but assumed to be in working order:

http://www.classicaudio.com/value/mz/
Thanks for your response but when it comes to amps like the model 2's the Bluebook doesn't accurately reflect the actual selling prices.I'm trying to find some recent sales.
you might do a "closed items" search on ebay to see what people are actually paying - after all it's really worth what you can get for it...