There is no current secondary guide to Harbour Lights. Your best bet would be to watch eBay.

The original Cape Hatteras HL102 still seems to be holding a high value with 266 released before the piece was resculpted.

There are some very rare variations which are listed on page 42 of the Collectors Guide.

But in today's market, what these pieces might be worth depends on finding a serious collector willing to pay high dollars for specific pieces when the rest of the Harbour Lights line is selling for pennies on the dollar.