The best quality I've ever found, and my go-to now, is Ted Hausotter, who sells on Ebay, aka Hop Heaven Inc. I know, Ebay? The guy personally selects his bales direct from the growers, does his own pelletizing, has complete quality control. Sells quantities from 8 oz, whole and pellets. His hops are green, sticky, smelly, and wonderful, you never knew what fresh hops were supposed to be if you haven't tried these. Great pricing and superb shipping too. Just be patient as he gets each year's new crop up on the web store.
I also like Puterbaugh Farms/Hops Direct. Minimum order 1 lb., but also very high quality and I've never had a "pound" of whole cone that wasn't at least 18 oz.