I found these shower caddy shelves on sale for $16.99 (usually $32.98) on Amazon. Clip the coupon to save 30%, and use code GLZ2SKVKR6F3 for 10% off. Pay only $10.19 for five shelves.
Are these shelves not the size you were looking for? Amazon's return policy is here to help. Additionally, Amazon sends you a prepaid shipping label to use at their drop-off locations.