Where can I find someone local or online to help me determine the value of my coin?

I recently stumbled across my coin collection, and discovered that I have a pretty rare coin in it. It is a 1776 continental currency dollar. On the front is a picture of the sun, and a sundial stating Mind your Business. On the back is a list of the first 13 colonies all linked by a chain type picture. That is the best description I can give by righting it out. I found Online Generic pharmacy a site that had it and said it could be worth some money, but I need to see if someone will look at mine and tell me what it's worth. I have been searching online and I keep running into dead ends. Please help!