At Dunkin' Donuts, get a $5 bonus Dunkin Donuts credit for free when you sign up for Dunkin Donuts perks and load $2 or more on your DD Perks Card via Masterpass. (The offer will appear once you've logged in.) That's the best extra credit we've seen this year from Dunkin' Donuts. (We did see a free $5 credit in July with Visa checkout, but that required a $10 minimum reload.) Deal ends November 17.