Edit (3/22/17): DD has (for now, at least) ended their referral program, so I can no longer send out any referrals 🙁
DD is running a new promotion in their DDPerks rewards app–schedule an “on the go” order, and receive $2 in your account. The strategy is to simply schedule an order for something that costs less than $2–say, a $1 donut–and not only did you get the donut for free, you also gained $1! You could even place the order and not pick it up, if you feel so inclined–you’re still coming out ahead.
For more free DD, if you sign up via a referral, we’ll both get a free any-size drink/coffee. Referrals are done via email only, so comment on this post or send me an email at hello [at symbol here] freefoodguy.com and I’ll refer you!