Check your local home brew shop first. Might be a touch more expensive ounce to ounce, but without shipping that might be your best deal.
And it's always a good idea to support your LHBS if you have a decent one. Hit the online shops for things they don't carry or if you can really get a better deal. Not all homebrew shops are good and some of them will try to hose you, but many are good and deserving of your support.