It is cheaper if you do it yourself, it doesn't have to be more expensive
make friends with your local butcher and i'd imagine you could get a lot of stuff for pence if not completely free.
I use Natural Instinct for convenience and ease when we first switched but I am starting to do more and more of it myself. Ready packaged stuff is of course more expensive.
Many people on here are far more experienced with raw than I am, and i'm sure Pudding in particular can offer you some excellent advice (she is very good at explaining it all - much better than me!
)
We had lots of toilet problems when Bingley was small, not a single issue since we switched to raw. I am so happy with it, and it is the best decision we've made. From the sounds of it a raw diet has helped with colitis, anecdotely at least, so if you do decide to give it a go i really hope it helps you too x