I tend to stick with coffee from local roasters, but I think that they all ship nationwide. These are my favorites:
Alana's Coffee Roasters
The Boy and The Bear
Maru Coffee
Tectonic Coffee
Groundwork Coffee (I think this one might be available nationally at Whole Foods)
A couple of others that I like that are not local:
Nguyen Coffee Supply (Be careful with this one. They use 100% Robusta beans, so the caffeine content is nearly double)
Stumptown Coffee Roasters (I believe that this one is also available nationwide through Whole Foods)
Caffe Vita (I used to be able to get these locally, but I think that they are only roasting in Seattle now)
Lady Falcon Coffee Club (The coffee is good, but the presentation is spectacular. I tend to send one of their giftboxes to my mother for Mother's Day every year.)
I prepare these via pour-over, French press, phin drip, moka pot, or cold brew. They would work fine in a drip machine when ground appropriately.