The crop top is a pretty choice for hot weather. Wear it solo or layered under a jacket and balance the cropped silhouette with high-waisted styles - a pencil skirt or wide-leg pants.
If you're a frugal shopper, your best bet is this Forever 21 Cropped Top. It's a great item, while not very expensive. Another strong contender for your wardrobe is this Forever 21 Cropped Top. While the price of this item is competitive, it will certainly attract a lot of attention.