I have been buying from www.reactivemetals.com for several years, especially because the price was about half the price of Riogrande, and because they offered more colors. The wires have no coils, but they sell coils seperately, in the various colors. I've sometimes mixed the colors for special color combinations.
reactivemetals.com also offers custom colors when ordering 100 or more wires per color. The custom colors they developed for me are a deep dark eggplant, and an apricot whis is a loveley light copper equivalent. If someone wanst to buy those colors, just ask for them, and the sales staff is super helpful. Mona