You can make your own rings or you can go to a site that has everything you need to finish what you have. Here is a site that has all sizes and types of metal, oh and even colored rings.
http://theringlord.com/cart/shopcontent.asp?type=materialsdata
They even have Scales for making scalemail. If you search youtube you can find some videos on how the chainmail is linked. I myself do 6 in one rings. It is a tighter looking chainmail but it is a little harder than 4 in one. Four in one would look cool, or even scalemail, but scalemaile is a lot harder. Its a pain to get it to lay right.
Like I said it look fine without it. So good luck with whatever you decide and keep up the great work.