Check out Purcell Mountain Farms for a stunning selection of every single freaking kind of bean under the freaking sun. Really. There are hundreds of bean varieties here, meticulously catalogued, with individual cooking instructions. There’s heirloom beans. There’s rare beans. There’s weird beans. There’s borlotti beans. There’s black turtle beans. Many of the varieties are available organic, too.
Available mail-order, by the pound.