Pet Food--More Convenient

So my dog doesn't eat the cheapest dog food out there....He eats Blue Buffalo, which costs a decent amount of money but I'm convinced its better for him.  I used to make a trip across town to the local Petsmart to pick up bags of this food (since I could use my Petperks card when it was on sale).  However, there's nothing really on that side of town that I need to get besides dog food.

Today I found a solution.  Petsmart.com offers free shipping on certain brands of dog food (Blue Buffalo is included.)  Not only that but I found a coupon code for $15 off a $75 purchase plus free shipping (which I was already getting...).  It made each bag $44.49 (ie. way cheaper than I've ever paid per bag even with my Petperks card in store.)

Moral: Why should I trek across town when I can get dog food delivered to my door for less than what I'd pay in-store?