I haven't heard of EZ soy in a slab. It's a trademarked name for BC's flakes, so that's weird. If you are having issues with the mushrooms, stop selling until you fix it. It could turn people off from your candles and you want returning customers. As for price, I've heard people say it's 3-4 times your cost and some say $1 per ounce, so you sound about right, maybe could charge a little more because your cost is very high. Good luck!