Tuition by Season

We have special classes that we like to offer (clinics throughout the year) that we would like to utilize special class prices for in the season set up (1 for $50, 3 for $125 for one time clinics, etc) WITHOUT this messing with regular monthly tuition. Would appreciate the ability to run tuition by seasons separately so we can setup these special clinics. We have several "seasons" set at the same time for various programs we offer.