Here's what I wrote in response, but then deleted because I don't want anyone to get their panties in a wad over me having an opinion (this message board has a LOT of rules to protect pansies).
I don't understand the problem. Why shop with a stroller anyway? It's not like you can fit much of Sam's merchandise on it, so do you push a stroller AND one of their carts? The carts have 2 spots for kids in them. There aren't many of us that have 3 kids needing to use a stroller at the same time. I have 3 under 4 years, and with a sling can shop just fine. Dragging carseats around isn't necessary if you have a sling or other baby carrier.
If container-izing your monkey of a toddler with a 5-point harness is really what's necessary, then urge Sam's club to install 5-point harnesses on their giant carts. I often wish carts had 5-point harnesses, but instead, I either get the kids to listen or leave the store.
I know I'm in the minority, but I don't see a need for strollers other than jogging strollers for jogging/walking, when for the sake of the workout, you need the kids to keep up. I don't have an infant carseat for Wyatt. I see them as one of those things that our culture has convinced people they need to spend a pretty penny on when it's just not necessary (except maybe for people with multiples).
An old military saying that I love is "Adapt and Overcome."
This particular member generally annoys me, so I would have just ignored her pleas for support but people are actually agreeing with her!!