When I'm on an early shift - Tim Hortons drive thru. On the later shifts - keurig at home, donut house blend medium roast one at home & one for the road in my travel mug.
I make it in my Keurig at home, usually. I used to buy the name brand Eight O'Clock or Dunkies but Ocean State Job Lot has these huge boxes of Donut Shop Blend so I buy that now. (I think you get 80 for $24.) It works for me. (Just bought some this morning!)
We also make a pot at work and have a Keurig - I keep some flavored coffees in my locker, but I usually give them to other people more than I use them myself. I'll have a cup from the pot if it's fresh. (Don't always have time to drink it, though!)
If I'm out and about and feel like a coffee it's from Dunkin - I usually have gift certificates in my wallet. Yesterday I got mine for 66 cents! (DD was mad because she ordered her ice coffee and it only applied to hot! )
Starbucks most of the time. If I'm up for regular coffee and have planned ahead, I'll drink my cold brew from home.
I really enjoy iced espresso drinks (well mainly lattes) and Starbucks rarely disappoints. I generally just get plain or with extra shots, but I had my first Pumpkin Spice Latte today.
Dunkin' Donuts is kind of awful for me on iced coffee. Their coffee in general is always really weak.