I bought a key similar to this http://www.ebay.com/itm/NEW-UNIQUE-FORD-LINCOLN-SWITCHBLADE-FLIP-KEY-REMOTE-COMBO-KEYLESS-ENTRY-KEY-/110758111145?pt=Motors_Car_Truck_Parts_Accessories&fits=Make%3ALincoln|Model%3ALS&hash=item19c9b2a7a9&vxp=mtr and my local dealer cut it for free. Luckily I already had two keys so I was able to program it myself.