Do they still have the chat option?
I've used that to make sure I got the disc I wanted.
Other sites can guarantee color and weight, so that's an option. Marshall Street is the one that come to mind. DiscGolfCenter also sells by color and weight.
Champ FB //Champ Banshee //FLX Avenger SS //Champ Mamba //QJLS,JLS //KC Pro Cheetah //Stratus //Comet //Star Wedge //Pro Rhyno //Evo Magic