Thule Locks

Price is for each lock core. Cheaper than RackAttack. (half price)
Different sets of Thule locks available.
All in great shape.
Compatible with all Thule products including roof racks, ski, bike, kayak and roof top cargo boxes.
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Thule's lock cylinders lock and unlock with the same key to eliminate the hassle of multiple keys. When ordering Thule One Key System lock cylinder packs we recommend that you purchase additional lock cylinders in anticipation of adding accessories.

* One key system secures all your lockable Thule accessories
* You can buy what you need or anticipate growth
* One key to unlock everything

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http://www.rackattack.com/product-pages/thule-lock-single-lock-core.asp