Cloche hoops

I have sheets of corrugated polycarbonate and wanted to use them for winter protection. I have seen metal cloche hoops online but they are quiet pricey and majority don't have the bottom support piece to hold it in place. Any DIYs or cheaper suppliers anyone knows of?
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https://www.toolstation.com/shop/p31388?r=googleshopping&rr=marin&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=EAIaIQobChMIuYCVrvuM3gIVFOd3Ch2R2gY0EAQYASABEgI9HPD_BwE
You might be able to blag some offcuts if you know a builder/plumber or have a nice person at the builders' merchants