Came across this cheap stem extender with adjustable height $8.75 aud shipped
http://www.banggood.com/Bicycle-Fork-Stem-Extender-Bike-Handlebar-Riser-Head-Up-Adapter-p-944888.html
http://www.banggood.com/Bicycle-Fork-Stem-Extender-Bike-Handlebar-Riser-Head-Up-Adapter-p-944888.html