I've done some research on products available in STL and the one that keeps coming up is the BTN cotton burr compost. I've read mixed reviews. Some say it's perfect. Some say it's junk. I'm trying to get a variety of compost to use in the Mel's mix and will be traveling to STL this weekend. Wanted to pick up a couple of bags of the best compost in the area. Any advice on where to go? Garden centers or hydroponics shops around town? Who has the best price? Thanks in advance!