It is very possible to grow potatoes from true pollinated seeds. I have been doing it for years. Potato seeds store for a long time, if kept dry. Enough seed to plant a large garden can fit into a small seed packet. Something like 85% of commercial varieties are sterile and thus don’t produce seeds. On my farm I have chosen to only grow varieties of potatoes that routinely produce seeds, and I store the seeds from them even if I most commonly grow from clones.
Regards, J the farmer.