You wanted to know how much space folding shopping carts would occupy in your market. The carts don't take up very much space at the size of 37"H x 18"W x 23"D.I found this one at Amazon.com if you would like to go there and look at it. I hope I have been of some help to you.
You can purchase a folding shopping cart online. You can purchase the cart on Amazon.com at www.amazon.com/Folding-Shopping-Cart-Liner.../B000LPFUG8 or Walmart at www.walmart.com/ip/4-Wheel...Folding-Shopping-Cart.../.
You can find a very good folding shopping cart with wheels on the Target website. Here it is: http://www.target.com/Mabis-Black-Folding-Shopping-Cart/dp/B0000C0XOD
Space ! You can fit more shopping in a cart than you can in a basket !
Unfortunately they do not make folding shopping carts like the ones that are found in the grocery stores. They do make little pull carts that fold. Therefore, a standard grocery cart would be able to hold more groceries.
The least expensive place to purchase a new folding shopping cart is Wal-Mart. Currently, Wal-Mart offers folding carts for 26 dollars. Folding carts can be found for slightly more money at Target, Overstock, and other department stores.
you press space bar
In 1937 Sylvan Goldman of Oklahoma City invented a shopping cart which was made of a folding chair with wheels. It was able to hold two separate baskets.
click space bar for it to do everything for you
A shopping cart full of groceries has more inertia.
The answer is 3 shopping cart hero's
Well if you want to buy cheap, you should check out http://www.amazon.com/Super-Shopping-Cart-Folding-Grocery/dp/B0000UZ58M. It is a very inexpensive folding grocery cart that seems decently built an durable to withstand your project. Its only 25$ but if you want a more normal sized one you can get one for about 50$ just about anywhere.
Shopping cart website can be found online. Every online store should have a shopping cart function, when one purchase something and put in the shopping cart before checkout.