Hoping to keep the rabbits at bay, we purchased a 100′ roll of black plastic 1″ tubing at Home Depot and cut it into 14 – 86″ pieces. As these keep their circular shape nicely, they work great for our garden frames:

PVC supports
We strung string along the top and sides to give it extra strength and support and then placed deer netting over the entire garden. Weighted down at the ends and along the sides, hopefully it will keep the rabbits from snacking on our lettuce and sprouting beans and peas!

Deer netting on supports
We can later add fleece to provide some shade from the hot summer sun and protection from flying insects, or plastic in the fall to extend our growing season.
I’ve been on a search today for plastic barrels to make our own rain barrels and compost bin like this one:

Compost bin
I’ve found two sources, stay tuned!