I love pu erh and appreciate a wide variety when placing an order for them. In no particular order my top 3 pu erh vendors are as follows:
Teavivre - Not a huge variety but great service and fresh produce.
Yunnan Sourcing - Great for a variety of pu erh
Dragon Tea House - A huge pu erh variety including some unusual ones
One of the intentionally aged teas, Pu-Erh has a loyal following.