Amazon has Meguiar's X2020 Supreme Shine Microfiber (3 pack) for $5.50. Free shipping with Prime.
Amazon.com: Meguiar's X2020 Supreme Shine Microfiber - Pack of 3: Automotive
Note, this item qualifies for 4-for-3 Promo; therefore, add 4 of these to cart and only get charged for 3. Discount will be shown in the last screen.