Alchemy Works - Harold Roth makes fine incenses and oils, and sells some other plant materia- seeds, dried herbs, etc.
Brianna Saussy - Bri offers intensive study classes, ritual/blessing work, readings, etc.
Camelia Elias - Camelia is a cartomantic powerhouse, fantastic writer, teacher, and crafter of enchantments.
Candlesmoke Chapel - Joseph & Sara Magnuson make fine conjure oils. Their Lodestone, High John, and a few others see heavy use in the shop.
Fabeku Fatunmise - Major business optimizer and suck exorcist. Top notch!
House of Orpheus - Marcus McCoy makes high grade, high octane, dead serious talismanic perfumes.
Jen Rue - Jen makes a variety of fantastic herbal products, and is a fine, fine writer. I use her Florida Water and Rue Water exclusively.
Jason Miller - Jason is a prolific author, and his Strategic Sorcery course is highly recommended, both as a brilliant starting place for those new to magic & sorcery and as an excellent fill-in-the-gaps/refresher course for the experienced practitioner.
Phytognosis- Jeremy Bechelli sells top quality resins, incenses, oils and other materia magica.
Quadrivium Supplies - Fine ritual oils done right!
Rosarium Blends Catamara Rosarium makes some of the finest magical oils I know of. Incenses, too.
Sarah Anne Lawless - My fairy witchmother! Fine occult arts, flying ointments, incenses, etc. A fine writer as well.
Wolf & Goat - Wolf & Goat produce oils, fumigations, powders, dirts, and statuary at a whole other level. Serious work.