Here are price estimations for feeding both of your dogs raw, based on RMB's that are less than $1 per lb. I have no clue what Roxy weighs, I'm guessing 30-40 lbs?

Feeding Lily for 30 days = 6 lbs = $4 per month

Feeding Roxy for 30 days = 30-45 lbs = $26 per month

So, that is $30 per month, and $360 per year, for a RMB diet. You can easily make $30 per month babysitting or whatever! =) And, it depends heavily on how much of a bargain hunter you are. That $30 could be cut in half, depending on your own local butchers and the deals you find.