On a recent trip to our local model store, All Aboard, we walked out the store and sat in the car before deciding that we needed a couple more sheets of plastikard after all and should take advantage of the excellent deal the store was having on old Humbrol paints. Walking back into the second hand room (where the discounted paint was), I stumbled on a pack of second hand awnings which I'd somehow completely overlooked the first time. Even more fortunate, they were only $1 (though the store kindly donated the awnings and paint to me).
The pair of awnings have made a fine addition to the goods yard at Sheffield Victoria. Unfortunately, we don't know their make so it is unlikely that anymore will be acquired.