Cascade is how I first got started on my lily addiction. It's all their fault! Back in the 1990s he also sold species seeds of alliums (quite a long list), hostas and misc. other species. Back then his seed list was three pages long, two columns/page. Plus plants.
The North American Lily Society lily seed sale is now open to everyone. There are still lots of seeds to choose from! They are also selling off all of the unsold seeds from previous years for just $ .55 per packet. These are found under the tab for 2010 seeds.