Came across the Instant Shelter site in my search for portable greenhouses. They also do temporary shelters etc. All products are nice and round on two sides.
The life of a garden can be extended with a clear plastic cover. One Troubled Times member recently received a catalog in his mail from a company that sells almost every bag or covering known to man. For instance, 20' x 100' of 4 millimeter polyethylene plastic sheeting is $69.60. The company is National Bag and the number is 1-800-247-6000.
Another member reports that a seed catalog from Jung Seed Co., (800) 247-5864, markets a floating row cover that needs no support. It is ideal on tomatoes, peppers, melons, cucumbers, squash and strawberries. The floating cover conserves moisture, protects from heavy rains, harsh winds, insects and birds. The cover allows water, fertilizer, and light to penetrate and ventilates heat on excessively sunny days.