$28 to ship a small bag?
Where are you located -- Outer Mongolia?
Seriously - I don't know all the facts here, so won't make a judgment on what they charged you for shipping, but I can say that I avoid companies that try to make a profit on the shipping charges, so they can keep the advertised price of the item artificially low. I'll even spend a couple of bucks extra to buy from a competitor that doesn't do that.