We want to grow Idaho® russet's in our garden here in eastern Oklahoma. We are much warmer and more humid than Idaho and we wonder if the potatoes would do well here. Also, I have been unable to find where I can buy starts. Do you know of any garden companies that sell them?

Only Idaho potatoes come from Idaho. As far as growing potatoes in your state, nearly all states grow potatoes. Check with the land grant college there or with the State Department of Agriculture.