It's easy to assume that more expensive cuts of meat are tastier or better than cheaper cuts, but you can actually make more delicious meals — particularly stews, casseroles, and curries — with the more affordable cuts.
Switch chicken breast fillets for chicken thighs, and go for lamb neck or shank instead of leg and beef skirt instead of fillet. You'll also find it much cheaper to buy turkey mince over red meat mince — and it's healthier too.
Comparison: Tesco Chicken Breast Portions cost £4 for 650g (that works out as £6.15 per kg), while Tesco British Chicken Thighs cost £3 for 1kg.