I am growing grapefruit from seeds that I have gotten from the grocery store (approx. 50). However, I want to grow many trees (approx. 1000). I know mostly grapefruit are grafted onto sour orange or some other rootstock, but I want to find seeds to make true seed trees. Where can I buy one or two quarts of Ruby Red or Rio Star or some other red fleshed grapefruit? Thank you for your time.