Q. Who sells ramps? ( A native plant)
Ramp, a.k.a. Wild Leek (Allium tricoccum) is quite sought after. If your question is "how do I grow ramp from seed or bulb" we checked the website of the supplier listed on Organic Gardening's website, Ramp Farm Specialties. Unfortunately, that supplier is sold out. Please see link below for their catalog.
I searched a forum and got a suggestion to try Tripple Brook Farm. See link below for Tripple Brook Farm's web site and catalog.
North Carolina State University has a good handout on Ramp cultivation. See link below.
Hope this helps!