Buy them online. You can get higher quality spices at lower prices. Penzey's is great for quality, variety, and when you need it now, but the prices are outrageous. If you don't mind buying in bulk (I suggest you should do it), get a vacuum packer and freeze the spices you don't immediately need. I don't cook in any particularly large volume (family of 3 with some friends), but I have bought spices by the pound and used the above method to preserve it. I also find you can get some pretty wild ingredients online. It's also nice to not have to go out, and I say that as somebody that shops in the strip like twice a week.