Massdrop.com is doing a bulk PLA buy. Only two colors, and not sure of quality, but $14.99/kg shipped once they get 15 orders.
Probably worth a shot at that price.
https://www.massdrop.com/buy/pla-printer-plastic
Joined via bitcoin 
You guys still need to put some sort of “colors box” in the right hand box area, so people can see at a glance the colors available.
@ThantiK I’m not affiliated with Massdrop.