I don't think there is a website for the East Coast but I know we have a buy/sell/trade event thing in May each year.. I only found out about it last year and missed it due to being out of the province
I have found kijiji to be helpful enough for finding them for sale but no real poultry friends to be made. I'm fairly new on this site as well and am liking is so far! Much friendlier than other forums I have been on.
There is one local to me here and it is called Performance Poultry. I have not dealt with them myself, but know people that have and they seem to have good reputation. I guess it depends on what you are looking for, as with any hatchery. There is also a place called JJ Farms that is near to me in Brighton, Ontario as well.
It looks like Performance Poultry has a lot of bantams that are usually harder to find and aren't as readily available (unless you're in the states...lol )