I second asking. A lot of times they won't advertise it, but butchers will sell bones for, like, a dollar a kilo over here. And I've found that sometimes they only have them on one day of the week and if you don't get in quick enough, they all get snapped up.
Over here, you can buy parts of kangaroo tails for dogs, but Penny's not really into it. I think the bones are a bit tough and pointy for her. She adores pig hocks, though. And hearts. Our old cat started eating again after several months of picking at his food just enough to keep himself alive for a bowl full of chopped heart.
We have found turkey necks to be a bit rough on the digestive systems of our dogs, just as a heads up, and we don't feed chicken necks because they're small enough that the dogs will try swallowing them whole, or minimal chewing. We tend to avoid marrow bones, but only because it hasn't mattered which dogs we've had at the time, but it's always ended in a fight, even when the dogs in question fight over nothing else. But I guess you probably won't have that problem.
Pssst, turkey necks look like giant penises. 
Melissa's family: Penny - corgi, Kit - wild hare, Bonnie - rabbit, Kivi Tarro - Finnish Lapphund
"She's always talking about her hare."