I buy my Kona cotton from the Fabric Shack. MSQC requires a minimum of .25 yd and HofPad requires a half yard purchase. Shipping from Fabric Shack is $3 in USA under $75 purchase.
There are 330 colors that RK offers. I have the color chart and there are two turquoise: Peacock and Jamaica. There is a yellow shade called Sunflower, another is called Plum, and another is called Tangerine, a green is called Leprechaun. You might check out RK website:
http://www.robertkaufman.com/fabrics/kona_cotton/