ARB just sent this our way:

Buy any one (1) qualifying Dana 30, 35 or 44 ARB Air Locking differential and receive one (1) matching ARB Differential Cover absolutely FREE!

Promotion is only available for the following ARB Air Locker models: RD100, RD101, RD102, RD103, RD105, RD109, RD113, RD116, RD117, RD125, RD147 & RD157.

Offer Valid: November 1st - December 31st, 2011

This offer is valid at any ARB distributor who carries the ARB Air Locker line.

To find an ARB distributor near you, click here. After completing your search, click on the 'Services' icon and look for the check mark next to the 'Air Lockers' category to the right of the address listing to determine if that dealer sells and/or installs ARB Air Locking Differentials. If the 'Air Lockers' category does not have a check mark, it indicates that the distributor either does not install or does not carry the ARB diff line.

Or call the ARB Customer Service Department for a recommendation in your area (888)-427-2872.