A method of assembling shopping carts includes providing a basket defining including rear upright frame members. Each rear upright frame member defines includes a lower connecting portion. The method further includes providing a first base and providing a second base. The first base includes a pair of first base supports each configured to be removably secured to one of the lower connecting portions. The second base includes a pair of second base supports each configured to be removably secured to one of lower connecting portions, and the second base is shaped differently than the first base. The method includes selecting one of the first base and the second base having a desired base size and shape, and removably securing the basket to the selected one of the first base and the second base including coupling each lower connecting portion with one of the first base supports and second base supports.