If you are talking trade-in value, you'll get laughed out of the store if you ask over $300 and I'd expect them to offer you between $200 and $250 if you're lucky.
I think Hawkeye's number are ok if you are selling the gun, but you're never going to get that out of it in trade with a gun store that is in business to make money. If you don't want to sell it yourself or can't living in Kalifornia, then I'd consider consignment over trade.
Ruger sent me a replacement LCP last year and the store I bought from offered me half of it's value when I asked what they would give me in trade. They even knew that it was new in box, direct to them from the factory.
I've never gotten a reasonable value out of anything I have traded.
-R