Number of coffees purchased:

S      (about $1.33 each)
M     (about $1.52 each)
L      (about $1.71 each)
XL   (about $1.90 each)

In this simulation, you have won (Ontario only):

cars (worth about $32000)
$5000 prepaid cards
grills (worth about $1078)
$100 prepaid cards
coffees (maximum worth about $1.90), donuts (worth about $0.89), etc
please play again

Summary (before taxes):
Approximate cost of coffees:    
Approximate value of prices:     (for simplicity, assume that you can only get coffee (75% chance) or donut (25% chance) and you always redeem for extra large coffee if you are awarded a coffee)
Discount percentage:                  %