If you guys don't know them, I have to mention Sunnyside Up Micro-Farm in Brunswick: http://www.sunnysideupmicrofarm.com/
Jill and Lloyd are wonderful people, with absolutely lovely chickensThey start with the best bloodlines they can find, and are continually working to improve their stock. Their prices are very reasonable for hatching eggs (some of the rarer breeds are a little pricy). The coronation sussex and barred cochins I just hatched out are both from there, and I had excellent development and hatch rate
Specifically on the BCMs, their stock is Wade/Presley bloodlines. Been hankering for some of them myself!
FYI they have an auction going on ebay right now for 10+ BCM eggs