I've physically seen them bought. My brother bought one of the newer starter decks at Wal-Mart a couple months ago. Anyway, I miss the cards with e-Reader support. They stopped after like 3 sets.
Back on the topic of worst games ever...Mega Man Battle Network 2, 4, and 5. Now, I picked these three because MMBN and MMBN3 were fun (or as fun as collect-a-thons get), and I've heard good things about MMBN6; however, I've played the other 3 games, and...they suck.