I think the supply is low because commercial growing for retail sales was illegal until 1/1/14. Stores are currently selling their MMJ suppy.
The prices will definitely drop after October when new regulations go into effect. Those without existing MMJ stores will be able to open retail shops or grow and sell wholesale.
Anyway, you have to live in CO for 2 years before they'll give you any cannabis license.
http://www.denverpost.com/marijuana/...ons?source=pkg