Get admission for guests for $10. Individual memberships are $20 and family memberships are $30 dollars. That's a savings of 60%.
Plus, there are a few more hours to grab this deal from Overstock.com. For $12 you can get $24 worth of discounted merchandise from the Bedding & Bath, Furniture, and Home & Garden departments. That's from Eversave. This promotional value expires on May 24, 2012.