I have been creating portable beaches in Altoid tins for approximately five years. When I began, I sold them on Etsy,com for about $5.00 plus tax and shipping and made about a nickel on each. While living in Florida, I raised the cost of each to $10 plus tax and shipping and sold more of them.
Here are some photos of ones I have created in the past. With summer coming, I will be making a few more.