AltaTac via eBay offers these Men's and Women's Pool Shoes in seven colors for $9.99 with free shipping. That's $60 off and tied with our August mention as the lowest total price we could find. They're available in men's sizes 7 to 12 and women's sizes 6 to 11, although not in all gender/size/color combinations.
What are you doing for fun that you could also do for money? Here are some ideas to get you thinking, and tips to get you started.