Discountmags has a 1-year subscription to the Economist for $51 w/ code ECON51. Students save an extra 10% off w/ code STUDENT10. Price is $45.90 after discounts. New subscribers only.
Note- student email is not required for this promo so it seems like anyone can apply it.
Also, there is an extra bonus offer for Money magazine for $2.99 once the item is in your cart.