Don't "Buy" the Plastic Trays

I work in a home improvement store, and every year, we sell those seed-starting kids. You know, those two-foot long plastic trays with a bunch of little holes you fill up with potting soil. They cost $4-7 apiece.

I saved my lettuce and cake containers for the last few months. Sure, they don't have the little individual holes, but if you plant carefully, that doesn't matter. Here's a photo of some of them, plus some marigolds, tomatoes and peppers I've started.