Brian,
Penzey's is my go to site for spices. You can buy in quantity for less than any local grocery store. I bulk buy my spices for butt mixes, rib mixes, and a few other spices for occasional use. The closest store to me is 2 hours away, so I stop when I can, but I shop on line most of the time. Like with the wsm, experimenting seems to be the way to learn. Good luck!