I'm the same.
I feed chicken frames, roo tails, beef tails, chicken wings, turkey necks and lamb shanks.
They also get mince (chicken, roo, beef, lamb - depending on the week) with vege slops. I'm trying to find somewhere I can get mince with ground bone in it though.
You can get a very high quality chicken frame mince from Lenards Chicken stores throughout Sydney - the best part is it is all human grade with not alot of fat in it all for $1.50 per kilo..
I hope this helps in your search for mince with bones. No mincer will ever cope with lamb or beef bones so I give those whole for breakfast, Beef Brisket is great as they can eat the whole thing easily. I use the chicken frame mince for their dinner mix.