Generally speaking the type of Puerh tea associated with having a
sweet taste is Black Puerh. Much of this can be attributed to the
unique fermentation process it undergoes during production. If you are
interested in learning more I uploaded an article a while back that
can be found at http://www.puerhcha.com/Articles/Black_Puerh_Tea.htm
Black Puerh is readily available from many online vendors.

Varat
http://www.puerhcha.com