Share your insights or perspective on the financial matter presented in the input.

What are some good ways to control costs for groceries?
Probably my biggest cost saving is to make my own sandwiches for lunch. I take this one step further by buying joints of meat to roast and slice for the filling. This not only tastes better but is quite a bit cheaper. For example today I roasted a 5 kg ham (about 11 lbs), it cost me £16 to buy (around $25), but I've sliced it, wrapped the slices in foil and frozen them. I've made around 20 packs, each pack has enough ham for sandwiches for me and my wife for a day. I also do this with beef, chicken and turkey and just get a pack of whatever we fancy out of the freezer the night before so it's defrosted enough to make sandwiches in the morning.