You could, but one good-quality pair of shoes is more practical in the long run if your feet have stopped growing.
If your goal is style, cheap rubber flip-flops are to be worn only at the beach and in the community showers at the YMCA. Andy Paige, author of Style on a Shoestring, put it this way: "One of the fastest ways to change your look is to change your shoes." Rubber flip-flops usually make your outfits look too casual, and even if you manage to pull off this look you will always look better in a leather pair. Also, flip-flops made of cheap materials do not have adequate arch support.
I bought my leather flip-flops six years ago. I wear them often and they still look cute. The same probably can't be said for a pair of old, cheap flip-flops. Leather ages well and can add an effortless style to your summer outfit. You will save money (and your style) each year because you won't need to buy a new pair for a very long time.