GoBo,
You are a frugal and wise gardener.
At home we save any and all food containers. Recently mushrooms are being sold in cheerful blue plastic containers that make excellent starter flats. After poking some holes they are good to go. We also eat Luigi's Lemon Ice just because we like the empty containers so much.
For us the yogurt containers are quart sized and are good for the plants requiring more growing space. We also save the cottage cheese and sour cream containers. Daisy sour cream not only tastes the best but comes in the sturdiest containers.
Don't forget the available space on top of the refrigerator; always room for a few plants up near the kitchen light.
Good luck and takes lots of photos!
