I have developed an online football squares pool game. It features 25 square grids for all pro, more than 100 college, and custom teams(local High school etc.). The business model is for potential pool managers to subscribe to offer up to ten games per week during football season, and pay by the game, 5-game, 10-game, or total season pass. They then offer the game grids to clients, who buy squares from them. Thus the website collects subscription revenue from managers of pools. I need a shopping cart to keep track of, and charge subscribers, for games offered. I've built the majority of the site already. I'm the only principal, and sole owner of the site.