This is the website link to a citrus aquaintance of mine John Panzarella. He is known in the citrus community for his citrus knowledge and amazing collection. The giant sized fruits from his cluster Panzarella lemon, Panzarella orange and also the Genoa (aka Panzarella) loquat always are show stoppers. He sells plants but doesn't ship. If you're in the area he offers grafting workshops and has open house & citrus tasting events.
http://johnpanza.googlepages.com/