I don't know if I posted it here before, but this is my trick for starting my own garden plants. I make pots out of quart-sized yogurt or cottage cheese containers.
I have been thinking about doing something similar with plastic containers I get my powdered mix drinks in from WalMart. I would cut them in half, so one part would be the bottom section which I would drill in some drain holes, and the top part could use the lid with drain holes and just invert that portion.

One thing... these are big pots. It takes a lot of potting soil to fill them. That would be very expensive for the number of starts I do, 85 +/- this year.
Those plastic powdered mix containers are a lot smaller. Probably good for lots of plants but maybe too small for larger things and you would have to then up pot them later.
So I make my own potting soil. The compost I get out of my compost pile and chicken run is a BIG part of that.
I was going to use my chicken run compost for seed starting in the house, but then I watched/read that taking living soil and compost from outside is a terrible idea if you are starting your seeds inside the house. Lots of problems with gnats, aphids, etc... if you bring in living soil into the house.
My long-term goal is to build a greenhouse outside so I can use more of my own compost and save even more money. But this year I ended up purchasing sterile potting mix for my seed starting inside the house. It won't save as much money, but it will probably save the marriage because I don't think Dear Wife would be very happy if the house filled up with fungus gnats and the like.
