For a inexpensive NiMH charger (~$35.99) try here.
http://www.amondotech.com/index.asp?...ROD&ProdID=990
It will handle 4-8 cells so if you upgrade you transimitter batteries it can handle them as well. It is a Peak charger you dont "quick" charge nimh but the charge for 3600's should not take too long maybe an hour depending on the amp setting you choose I would use 2amp but the charger can put out 4amp.
Hope it helps.