The information I've seen suggests that growing potatoes from seed is a labor-intensive project, to say nothing of being a regular disappointment. The poster at
http://tomatoville.com referenced above has been getting seeds from potatoes for a number of years and he says it's potluck as to the results you get until you have bred several generations.
The post at
http://www.growseed.org/potato-breeding.html is geared to the do-it-yourselfer who wants to
breed potatoes. It is not a source of potato seed, and the gentleman who posts on the tomatoville forum says the growseed.org method is not one he'd try because it's too easy to spread potato diseases using that method.
This company does 55,000 tons of potato 'seeds' a year, but they do
microtubers, not actual seeds, and use tissue culture to produce new plants. Wikipedia says "Commercial growers plant potatoes as a row crop using seed tubers, young plants or microtubers and may mound the entire row." No seeds, and you'd think that commercial growers would find seeds of value in potato cultivation.