Make your own compost!
It's fun! It's Easy! It's free!
Make a pile out of lawn clippings, tree litter, leaves, old dead plants. No need to be too scientific about the mix of brown (carbon) and green (nitrogen) materials. The best thing for compost is kitchen scraps. Make a hole, dump them in and cover them up (helps keep the flies and gnats away).
Turn the pile with a shovel or pitch fork and water it to keep the micro-bugs active. Do this weekly or so.
(I turned this pile every other day when I took out kitchen scraps.)
About eight weeks later I had brown gold - nature's alchemy! Use it as a planting soil, fertilizer amendment, or top mulch. Anywhere in the garden, it's good stuff!
Check out my compost workshop coming up at the Phoenix Downtown Farmer's Market.