I like Smart Ones forzen entrees...they are on sale at Target all the time! My kids are 7 and 3 and I still have a hard time finding the time to make myself a healthy lunch!
Veggies like baby carrots and celery sticks are GREAT snacks and require very little prep time. I try to pre-cut the celery into the same size as the baby carrotts that way i can just grab a sandwich bag and stuff that into my purse on the way to the park with the kids