As a reference point, a packet of Lacinato Kale from Seed Savers Exchange (one of my favorite suppliers) is around $4 for 150 seeds. Let's say you plant one 36-count flat of Kale starts, and save the remaining seeds for future seasons (or to foodscape with), you'll end up with 36 Kale starts ready in May at a cost of around $1, or about three cents each.
So, three cents per plant. After you factor in soil, flats to grow in, a low cost fluorescent light--all in you're at about ten cents per plant. Compare this with $8 - $12 per plant from the nursery in our neighborhood, and you can see that growing from seed can quickly save you hundreds of dollars per year on plant costs, while giving you superior organic plant stock to boot. The beauty is that you can then save seeds from the Kale plants that you plant this summer (let a few go late into the season until seeds form) to plant next year, further taking you to a closed loop growing system!
We order our seeds in early to mid-February, plant them by end of February, and have thousands of plants ready to go by spring. I recommend you take on the learning curve of growing from seed as soon as possible, and we are here to answer any questions. Also, if this isn't your year to start, we sell our organic veggie starts as part of our raised garden beds installs in Denver for a fraction of the cost compared with buying from a nursery. More on growing your own seed starts to come!