I would also suggest going to Ebay and researching past prices and getting a feel for recent values. Also listing them on ebay will let competitive bidding fetch a market price.

Here's a link to Harbour Lights on Ebay,
Harbour Lights on Ebay

You can check off the button to see completed auctions and or only sold/completed auctions. And don't assume the asking price of other auctions is a true market price, check the price of sold pieces for a more realistic value. There are a lot of wishful/price sellers out there.

Good Luck, Mark