Canon used to make one and supplied it with the Canon 60D along with the AC adapter, the later digital cameras were only supplied with the usual single charger with no adapter. I kept the twin charger when I sold the 60D on as it was really useful being able to put them on charge at night and take them off in the morning both charged for a days shoot. They only charge one at a time but switch to the other battery when it is charged.
It may be worth trying to find one S/H. I have seen a new charger recently advertised that took various plates for different batteries and charged two batteries similar to the Canon one. I shall try and look it up and let you know if i can find it.