First, I would guess that and local feed & seed store can beat online prices when you include shipping. But will they have the varieties your friend wants?
I second Johnny's, Territorial, Fedco and maybe Hazzards.
Fedco has some "group ordering deal" that I assume gets you more discount as you order more seeds.
http://www.johnnyseeds.com/
http://www.territorialseed.com...
http://www.fedcoseeds.com/grou...
http://www.hazzardsgreenhouse....
Even the Baker Creek website has some "1/2 pound " packets that have fairly good prices. But they hide them well! One of the "Vegetable" types is "Bulk Vegetables".
http://www.rareseeds.com/store...
I would go to Tainong Seeds for pound-plus-size orders of anything Oriental.
Or to Kitazawa for an even wider variety of Asian seeds, and ask about bulk prices.
http://www.tainongseeds.com/
http://www.kitazawaseed.com/