I don't think you are going to find what you are looking for. Most named varieties of citrus are grafted because their root systems are very susceptible to various diseases. Its also true that most named varieties do not grow true from seed. Therefore they are grown from cuttings which are usually grafted because most citrus cuttings do not root well. Not that they won't root but they are not reliable rooters and their roots are susceptible to disease. Your best bet would be to find someone with the variety you want and ask them to air-layer one for you.

try RSI Growers....

Here is a link that might be useful: RSI Growers