Buying discount coffee online does not mean just the run of the mill grocery store brands, although you can find savings on those as well. You may not know it, but you can almost always find gourmet and specialty blends online for less than half of the full price you would find in bricks and mortar retail stores.
How come?
Online retailers have the edge. They routinely sell either at, or slightly above wholesale and consistently beat out the store based local retailers due to lower overhead. With low overhead online retailers offer great savings, good service, free or low cost shipping, and make up the difference in volume undercutting the price of your local store.
What's the catch?
There isn't one really. You just need to buy in large enough volume to get the discount on the special offer, and free shipping on a minimum purchase to make the deal work. Don't let bulk purchases scare you. In this case bulk is not really that much. Coffee lasts a long time in the fridge, especially if you buy whole beans rather than ground, so you do not need to worry about using all the coffee.
Here's another shopping tip:
In addition to discount coffee, you can buy many shelf stable products for deep discounts online. The savings can be spectacular on some sales and special offers. As always, do the math to be sure you are getting a good deal.
Two good resources for buying coffee online:
Save $20 on Starbucks Gourmet Coffee
If you are looking for other brands besides Starbucks, try the discount coffee page for all other brands at big savings of 50-70% off.
The long and the short of it...don't go to a cheaper brand you would enjoy less if you love good coffee. Shop smarter, and buy discount coffee online.