We are in a very rural area so they actually shoot the rabbits around me and then drop them off...I had to learn to dress them myself :*gh: {especially hard as I'm vegetarian
} but it is worth it as they average 1kg in weight {meat and bones} after skinning and gutting.
Otherwise they just bin them :yikes which is a dreadful waste.
My Mother managed to buy rabbit at her local farmers' market in Norfolk - for £1.50 each which was cheap. I guess that they shoot them too and then sell them.
If you're in the countryside it's worth asking around - also if there is anyone locally who hunts with ferrets or birds of prey.
Chickens - I tend to buy whole chickens {hubby eats meat} and then cut them up. Although my local butcher sells chicken "backs" for £1.50 {the carcase and two wings} - but I leave more meat on mine.
Lamb ribs you can sometimes get free from meat wholesalers - also heart is cheap. We can also get ox "lights" which are lungs very cheap. They are not that nutritious though - but are great for drying in a low oven and feeding as a treat.
Obviously anything I buy raw I freeze for at least a week before feeding.
Chicken wings or thighs I leave the skin on {unless you have a Cavalier prone to weight gain or pancreatitis, then you need to remove as much skin as possible}. NEVER feed turkey skin, cooked or raw.
Heart is counted as a muscle meat, not offal.
We also feed raw tripe - which I buy from Pets at Home or a local independent pet shop, but it's expensive at 75 to 80p for 400g.
If you don't want to feed bones at all, you can use BioMineral
http://www.luposan.de/en/biomineral.html which you can get from the Markus Muehle lady too.
We also use Markus Muehle dried food
http://www.markus-muehle.de/en/naturnahfutter.htm which is one of the best dried foods I've found. You can obtain it direct from them, for £39 for a 15kg bag including delivery, which is very reasonable. I did the food grading system on it and it comes out as an A+.