Axial EXO Aluminum Shock Set
Axial now has Aluminum Front and Rear Shock Sets to replace your stock plastic ones on the EXO. They are threaded for easy pre-load adjustments, and come with everything you need except shock oil. That, and you will need to assemble them. You get 2 shocks in the set, and they should be under the $50 price when they hit shelves or online retailers.
Hit the Axial site if you need more details.