Restricted Sweeps – Sweeps which needs codes,  are only valid in limited number of states,  are limited by age, profession or other qualifier.
There is usually a no-purchase method of obtaining codes.  See the rules to find out how to enter without buying the product.

Smithfield Upgrade to a Better Bacon  04/01/12
Needs Code

Pampers Pull-Ups Instant Win & Sweepstakes 05/11/12
Requires Code

Coco-Cola®/Church’s Chicken Bring It Home & Pay It Forward Sweepstakes 02/29/12
Limited to AL, AZ, MI and TX – 3 Entries per day

The Dean Foods Start Right~End Right Sweepstakes 02/26/12
Void in CO and LA  ~ Need Code from Milk Cap

ESPN Diet Mtn Dew – Fuel the Frenzy 04/19/12
Requires Code from Purchase

Needs Code