Off-topic: let's say I have a really old (~18y) two-words-smashed-together domain name that I think would probably fetch a decent price and that I've considered selling. What are some reputable sites where I could obtain a reasonably accurate "valuation" of the domain?

Basically, I'd like to get a realistic idea of what it might be worth before going through the trouble of actually trying to sell it.

Coincidence? Or this link gets posted by a brand new account and your first post in a year is how it's for sale? Doesn't sound coincidental to me.