Cast a random Lesson spell without paying its mana color. If that spell has X in its mana cost, X is 3. (As of today, there are 20 lessons. Perhaps look up a list and roll a d20?)
Near Mint - $45.50
Lightly Played - $36.40
Moderately Played - $31.90
Heavily Played - $27.30
Damaged - $22.80
Near Mint Spanish - $45.50
Lightly Played Spanish - $36.40
Moderately Played Spanish - $31.90
Heavily Played Spanish - $27.30
Damaged Spanish - $22.80