I've been watching Nikon F3HP and Nikon F2A prices for the past 5 years on eBay. Back between 2005-2008, I bought four F3HP bodies in excellent condition for $180~$220. Earlier this year, I bought another one for $190. Prices seem to be consistent for excellent F3 bodies. On the other hand, excellent + or better bodies go for significantly more.
I also noticed that Nikon FE2 and FM2 bodies are priced pretty much the same as F3HP bodies in similar condition.
These are my observations. Yours may vary.