Unfortunatelt Fosse - bones are hard to cme by in our area now - we used to be able to go to the slaughter house but alas - the supermakets dont' seem to have bones???? and the indepentant butchers are few and far between.
and - sadly - you can't feed a dog on bones alone

Unfortunately it is hard to get by without a good local butcher, however Landywoods are a reasonable alternative if you're stuck (and have enough freezer space unlike me!). See Landywood Pet Foods : Price List.

I am lucky enough to have a fantastic farm shop close by where I can get lamb breasts for next to nothing, lamb hearts for a bit more, pork ribs, chicken livers and best of all chicken carcasses with the wings left on for absolutely nothing! Fish I sadly have to get from the supermarket as our local fishmongers closed down several years ago

It can be done with just a supermarket as a source, it does work out a bit more expensive this way, but still cheaper than buying Hills from your vet! Chicken wings are a perfect way to start and work out about £1.38 a kilo. Offal is also usually in plentiful supply and you can be quite creative in the reduced corner! Look in the frozen section for bags of whole fish such as sardines/mackerel etc.

The supplements I sourced from Quality vitamins, minerals & nutritional supplements - Simply Supplements , however their delivery is not the quickest!

Sorry for rambling a bit but I hope this helps, I have a tendancy of getting a bit evangelical about raw feeding, particularly when it comes to labs as it has made such a difference to two of mine!