Pricing?

I'm looking for some more accurate pricing other than NADA and KBB sources for the rides I own. Here's the low down, I have 2 2005 model Honda Aquatrax, one is the R-12X turbo model and the other is the plain R-12. Even though they are '05 models I bought them brand new in 2007, both are still under factory warranty, have less than 40 hours, and are sitting on a 2007 Shoreland'r trailer. Neither has been in salt water and both have always been garage kept when out of the water. No pricing I've found online feels accurate enough to me or am I just being sentimental towards my rides. Any help on this welcome. :dunno: