Frost blankets are inexpensive, easy to store after winter use, water passes through them and the temperature under them will be about 10 degrees higher than the outside air. I use them in my nursery in order to have my shrubs, hosta and blooming perennials ready to sell in early May. Here is a picture of some of my plants under frost blankets already this year. We have had danger of frost this week so I didn't leave anything to chance. I will remove these for a week or so now that it looks like we will get 70's the rest of the week - life in the mid-south! The clip is how I secure them to my raised beds. Landscaping pins will work to hold them to the ground. Some people make mini-hoop houses from bike flag holders or PVC pipe too.
I store mine in a big plastic tub in the summer. I just slide it under a shelf in my greenhouse but it could go in a garage, shed or anywhere you have room. Heck, you could put them in a drawer somewhere too. These handy blankets come in various sizes and are readily available on line. One of my favorite suppliers is Greenhouse Mega Store . Below is the one I bought.