This isn't an online company, but you can use this link to get their number to call for a catalog. The selection is small, but so are the prices- and the plants for that matter ;-). He is in Duluth and originally started Shady Oaks Hostas which is now run by his son and is strictly wholesale but he sells some of the hostas through his catalog. Like I say, the plants, prices and catalog are small but always contain a few gems.

tj

Here is a link that might be useful: North Wind Perennials