This Creative Indoor Mini Gardens Course from International Open Academy, originally $119, is now $12. We couldn't find this class anywhere else, but similar ones start at $20. You'll learn how to create your own indoor mini gardens with tropical plants, cacti, air plants, and mosses. Lessons will instruct on what to look for when buying plants to how to choose vessels and containers and using the right soils and decor. Sales tax is charged in most states.