I’ve got some 1st class, used ones for sale at £75.00 including postage and packaging. I bought a load for my cars before I had storage. They are tailor made for the Fiat 126 and imported from Italy. In my view they are the best you can buy.
All of that said, I am no longer a fan of outdoor car covers, they do protect the car, keep it dry and are better than nothing but they can cause the car to condensate inside and don’t protect it from water evaporation underneath.
Please get in touch if anyone would like one, finding storage is a better long term solution.