My experience is that even with the most awful transit system it is possible to make group trips with multiple families together with one card using one person'

My experience is that even with the most awful transit system it is possible to make group trips with multiple families together with one card using one person's car. Even in a city with no transit at all surely you can find someone once a month willing to drive in exchange for free access to the lower prices on stuff, it's just common sense. Now Costco versus other options is hard to say, but their prices on certain things are hard to beat.