Shimano has FINALLY made a quick-link for its chain - BikeRadar
IRD (Shimano) 10 Speed Chain Snap Link III
Amazon.com : Tongli 10 Speed/9 Speed Bike Chain - 116 Links - 1/2 x 11/128 Inch - Compatible with Shimano/KMC/Campagnolo/SRAM for Road & Mountain Bike : Sports & Outdoors
10 Speed Quick Link Chain for Shimano - Equipment - TrainerRoad