You can certainly buy them in the UK !... However, the only ones I've seen come as one broad strip - which you cut to size. I know Sainsbury's, Boots, ASDA and Wilkinsons all sell fabric plasters.
check
One can buy plasters online from any home improvement retailers, such as Home Depot, Lowe's, Rona, Canadian Tire, in store or online. They also carry fireproof plasters.
by a normal plaster from the shops and paint it green.
Johnson johnson back plaster
This place should have pretty much any type of fabric you can imagine. I make the costumes for our local youth theater and I buy all the fabric from here. I like Joann's. They are always having great sales.
The best place to buy fabric in Philadelphia is at fabric store. A fabric store will have a selection of curtain fabric for you to choose from and can assist you.
mood is a good place to shop for fabric.
Cheap quilt fabric is readily available online. One can go to eQuilter, Fabric, Quilt Fabric Closeouts and Fabric Depot to look for cheap quilt fabric.
joann fabric & craft stores hobby lobby
yes yes...as long as you buy the fabric
You can do research on the most durable fabric and then locate local retailers that sell patio furniture and see if any of the items they offer are made with the fabric. Some may or may not sell this type of fabric. If not you can purchase the fabric and either make your own cushions or find a seamstress that is able to.
If you want a few yards you can buy it in a fabric store.