Some of my favorites have been mentioned already (Arcana, BPAL, Villainess) but a couple haven't.
Nene's Kitchen Melts. After Panhandle Potions went out of business I searched high and low for another "tart" company that makes wax melts that are as strong and as yummy as PP tarts were. (I don't want to pay $1 for a tart that I can maybe smell a little bit whenever I walk through the kitchen. I want one that's so strong that when someone walks in the front door she might mistakenly think I've been baking blueberry muffins. And I'd like to be able to get at least 2-3 burns out of it.) Nene's are awesome. Very strong tarts that smell wonderful, and she makes several coffee scents that are all good. Communication is friendly and shipping is fast. I really like this etailer a lot.
Alima Cosmetics. A friend introduced me to Alima, and I love them. Silky smooth, beautiful colors, nice owner, quick shipping. Plus the prices are good.