Cost of Home vs. Business Shipping

I just ordered a new hard drive from PC Connection and when I went to check out I got quite a surprise.

I realize that for a while companies have been charging more for shipping to residential addresses than business, but PC Connection has taken this to a whole new level. My home address was first on the account as the account pre-dates my office, so when I went to buy the drive it was pre-selected and shipping was charged thusly:

Whoa. I switched it to my business address and:

got free shipping instead. Much better.