[jlgaddis]

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.

[joelrunyon]

Valuations: domainiq.com + godaddy valuations (ballpark) - https://www.godaddy.com/domain-value-appraisal

You can sell via uniregistry.com, sedo.com, or flippa.

What's the name?

[rainieri]

Flippa is one place. Otherwise hit NameCheap marketplace and look for domains similar to yours with the same TLD and get an idea of the price.