fyi, you can not do donuts with a cutter...you can do circles but to get the center you need a diamond drill.
did you check with your local glass shop to see if they would bang some circles out for you, then you go buy the diamond bit and drill them yourself? I use to do that, was very successful (after making a few shards) and soon developed the water soaked sponge, flowing water, water pic, mechanical drill press apparatus device
Pat B
laserman532 on ebay
Been there, done that, got the t-shirt & selling it in a garage sale.