https://monsters.steempeak.com/ is one of the best sites to purchase individual cards. Collecting commons at 2-4 cents has made people 4x earnings over the last 8 months. We have 600k booster packs left for sale. When those are gone there's no more supply of those cards and the value climbs. Many of the alpha commons are now trading for 16cents or more, which is the best return in crypto right now!