The whole chickens at my local Sams (probably the same one Ron_L uses) are injected. I complained about the misleading labeling (Natural Chicken) and the manager said he would get back to me about it but so far has not.
I've also been less than pleased with the produce. I hate going through the items on display trying to find one that is not moldy!
I don't expect them to change chicken vendors on one customer's account but I can at least let them know why I don't buy chickens there any more. And if enough things make my "do not buy" list I'll drop my membership again.
I have been getting briskets, ribs and butts there and have been happy with those.