FYI: UC Riverside has a program to distribute disease-free citrus clones. It’s not cheap, but they seem to have -everything-. (Grafting’s not easy either. My success rate is so-so) https://ccpp.ucr.edu/

The varieties they grow:

https://todolicitrusfundacio.org/en/the-citrus-collection/varietal-groups/

This list includes varieties of Citrons, Mandarins, Pummelos, Lemons, Limes, Bitter Oranges, Sweet Oranges, Grapefruits, Kumquats, Papayas, Australian Limes and citrus related varieties, including some hybrids.

Buddha's hand is fairly well known.

I wanna take a bite out of that Buddha's hand, I wonder what it tastes like. Has anyone tried it?

Now with 189% more peel!