Ancient Wisdom and Pagan Spirituality

Mountain Rose Herbs. They source their white sage from a farm where it is sustainably grown. White sage is being over harvested in the wild, so Mountain Rose is a good place to buy from. They have a website, so you can order online. This sage is listed as White sage, cultivated, in the bulk herbs and spices section of the online catalog.

With that said, it's possible to make your own cleansing incense. Crush together a combination of dried herbs: garden sage, lavender, evergreens like cedar, pine, or fir. You can add some dried lemon peel or grapefruit peel, or a few drops of essential oils of citrus. I like to add a bit of crushed frankincense or myrrh resin. This loose incense burns better on incense charcoal .You can find this special charcoal at places that sell incense resins: some natural food stores sell it. The website for Mountain Rose Herbs has everything you need, including bundles of sage and other herbs for clearing your space. It's listed under Aromatherapy, with a sub heading of candles and burnables.
I have found that garden sage can do a good job of space clearing, but I always pair it with cedar, which is one of my favorite plants.
Good luck and bright blessings, whatever you do.