Where are you? UK or US?
UK has some great nurseries, Happy2Nappy was great (personal experience) and I'm sure there are lots of great places.
A google search of "Adult Baby Nurseries" or "ABDL nurseries" were the main ways of finding them, try this: http://lmgtfy.com/?q=ABDL+nursery or http://lmgtfy.com/?q=ABDL+nursery+UK