FIG. 1 is a perspective view of a cupholder for a shopping cart, showing my new design;
FIG. 2 is a top plan thereof;
FIG. 3 is a bottom plan thereof;
FIG. 4 is a front elevation thereof;
FIG. 5 is a rear elevation thereof;
FIG. 6 is a side view thereof, the other side being a mirror image; and,
FIG. 7 is an exploded perspective view thereof.
Portions of a basket of a shopping cart and other elements of a shopping cart, as shown in broken lines, are shown for illustrative purposes only and form no part of the claimed design.