The Wanhao factory website (http://www.wanhao3dprinter.com/) has a list of resellers around the world at.  Additionally, some recommended vendors are:

• Uncle Chuck’s 3D Printer Stuff: http://unclechucks3dprinterstuff.com
• The Ultimate 3d Printing Store: http://ultimate3dprintingstore.com
• https://www.3dprintersonlinestore.com