Depends on what kind of beans you buy! Costco has a free trade organic variety that I think is $9 for 3 lbs, which is a freaking deal! Sometimes we buy there, or Trader Joes has good prices too - $6 dollars for a lb. My grocery store has whole beans in bulk so we buy those sometimes for $5 a lb. New Seasons/Whole Foods sells theirs (in bulk) for $10 a lb I think.
We make coffee every morning for two people (8 'cups' according to the coffee maker) and go through a little less than 1 lb. a week. So that could be as little as $12 a month (buying at Costco) or as much as $40 a month (buying at New Seasons/Whole foods).
HTH!
__________________
To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}
Ditto to Costco and Trader Joe's for coffee. The Kirkland's brand of coffee at Costco is actually roasted by Starbucks, so you're getting essentially the same coffee for 1/3 of the price of a Starbucks pound.
For what it's worth, DH and I drink 11 "cups" a day (I say "cups" with quotations because the coffee maker's idea of a cup is ridiculous) and we go through a little over a pound a week.
DH and I get coffee from Wegman's (grocery store near us, it's FABULOUS if you have one near you) for about $7 or $8 a pound, and each bag lasts us a little over a week. So, we save lots of $$ because 2 starbucks coffees (if I get something fancy) is almost $8. You'll really notice the difference, I used to go to Starbucks every day, sometimes twice a day!
I get good coffee for arounf $8 per pound (on average) and I go through probabaly 2 pounds per months (4 "cups"- which fills a travel mug and a half- per day.)