We switched our old BM to a raw-ish diet when we had her and although she didn't have to be forced, it did take her a while to work her brain around eating a large hunk of meat instead of small bites (as a treat) or her old kibble. We had to start like chuckorlando did: crushing the bones or straight-up removing them. At first Ebony turned up her nose but we got in the habit of cracking a raw egg over the whole mess (raw chicken or fish with baked sweet potato) and that helped whet her appetite. After a while, she got used to it and really looked forward to her "people-food" style meals.
The issue is when you take a dog who's known nothing but kibble and try to feed them raw meat. It's new and weird and they sometimes don't seem to be sure if it's really food or not but after some time - and occasionally "tough love" in not giving them any other option - they get the hang of it.
As to where we get the meat, it varies. My husband hunts and we raise our own beef, so that helps. Chicken's also pretty cheap especially if you can get it at Aldi's or WalMart or something. I know at the WM here, we can get a giant 10-lb bag of chicken parts (thighs and backs) for a few bucks. We added sweet potatoes to Ebony's diet and they're pretty cheap. A lot of the time you can hit up a butcher for hearts, tripe, kidneys, etc. on the cheap too. Fish was a nice treat to break the daily monotony: we either used raw smelt from the freezer or bought canned mackeral or herring. Smells horrific, but the fish oils really helped the poor girl's allergic skin and dandruff.
Guess what I'm trying to say is: there's a lot of options out there and everyone's got a different "way" they do raw. It comes down to whatever is nutritionally balanced and feasible. Sometimes it's easier to get one meat than another (like on Sundays, when grocers discount nearly-expired meat) and of course people are split on whether to add a veggie or not.
It's a bit more effort to do the raw thing, but in the long run it can be a lot cheaper plus (TMI warning), it makes their poops smaller and less smelly; there's not as much "filler" going through.
~Marrow