My ST is in North Lower - it cost £316 for 23 games (approx £13.74/game)
If I'd have bought a ticket on a game by game basis the total cost would've been £603 (approx. £26.22/game). A total saving of £287 if ticket is used for all games.
The highest price ticket was £30 (five times), the lowest was £15 (three times). So even the lowest was more expensive than the average ST game.
I only missed 1 home game so the figures would alter slightly.