I save seed from open pollinated crops like tomatoes or beans. If you can find non-hybrid varieties that do well for you, it sometimes makes sense to save your seed from them. They can become acclimated to your area better than seed you may get, that has been grown in other areas.

GG

Last year my cost/revenue figures were almost idententical to yours. But that was mostly for sampling many different varieties. This year I spent a lot less of seed and expect to make more, because I have a better idea of what grows and sells well in this area. How much space do you have? Are you planting thickly and then spending lots of time thinning?

My seed costs last year were 2% of my gross income.