Do you have any Chinese markets around?
You won't find this type of price in the usual run of the mill grocery chains unless like you said there is some sort of a blow out sale. Are there any raw feeding co-ops around? There has to be some way for you to get in touch with some sort of a supplier or whole saler. Chicken and Turkey shouldn't be this expensive unless you live some where very remote in which case maybe you can have a supplier send you shipments directly. Buy in bulk and share with any other local raw feeders?