This is the " Bubble house" and you use plastic sheeting, duct tape, and a fan (and scissors) to make it. (instructions on site) and the cheapest i could find (plastic sheeting) was a 10ft by 25 ft. for $9.98 and the other one was $25.00 for a 12ft x 400ft.
How to make a tiered watermelon cake with fresh fruit decorations. Click the link on the bottom of the post to check out all kinds of watermelon cakes. Great for any summer or outdoor party or a glutenfree diet. From Apron Strings.