The ponies all head to the Rainbow Falls trade exchange, hoping to get some pretty good deals. But things don't turn out the way they planned as Rainbow Dash tries to make a bunch of trades in hopes of getting a limited edition book and Applejack and Rarity argue over what they should buy. Also, Pinkie Pie tries to convince everyone to buy Twilight's used books simply because she's a princess and Twilight is not too happy about that.
Discussion for episode 22 is open, everypony! As always, spoilers are welcome and to be expected!