The cups are $11.99 and the 2 designs hold the same amount. One is designed to fit car cupholders, the other one will not fit. The great thing about Pop is that they have Icee machines, which the other resort do not have. Also, Pop has skim milk available for the coffee, which actually saves money cuz we didn't have to buy milk for the cereal! We love the food court at Pop; it's really the best.
Regarding their cost-effectiveness, it all depends on how often you will use them, but if you use them at least once a day, they should pay off because drinks are about $2. So, $2 x 7 = $14... If you use them more than once a day, then they are definitely a good buy.