KP are *extremely* tough to get. Toddler Tula was perfect for my son at 36". It's extremely supportive and easy to come by. Standard could fit, but there's no point in buying that at 36". Other options to consider are Beco Toddler (tough to get at the moment), Lillebaby CarryOn and Lenny Lamb Toddler.

Lenny Lamb (many on sale): http://www.mysweetpickles.com/search...ch=GO?AffId=10

Lillebaby CarryOn: http://www.mysweetpickles.com/lllbab....html?AffId=10

Toddler Tula: http://www.sweetbottomsbaby.com/Tula...tm?Click=20209