Postmates is offering 2-Months of Postmates Unlimited for FREE (regularly $9.99/month) for a limited time. To get this deal, sign in to your account and in Account Settings under your Profile use the promo code: ATTTHANKS in the Promos and Credits section. Then sign up for Unlimited Deliveries and a 2-month trial will be waiting for you.
Postmates is the get-anything-delivered service. It usually charges $5.99 per delivery (or $3.99 for deliveries from Postmates partners). Postmates Unlimited is for frequent Postmates users and there are no delivery fees on orders over $20.