I have shared on Making Home how having a four-week rotating meal plan helps me so much. Crystal's online course "Supermarket Savings" (which it appears is no longer available) helped me SO much in this area. Other things I do to save time/money include:
* making double or triple batches of things and freezing things so that I can use them to reduce cook time later.
* bending my "plan" to fit reality (for example, if we are having people over Tuesday night, but Tuesday's "planned" meal is something boring, I'll switch it out with something else planned that week so that I'll for sure have all the ingredients but have something more savory to serve to guests)
* cooking from scratch a lot (while still buying store-bought in some areas to keep things simple)
What ideas do you have for saving money/time, particularly on the planning/preparation end of things in the kitchen?