++++++sun-cackled+++++
So not glass? Either acrylic [ Plexiglass] or polycarbonate [Lexan]
Have you examined it thoroughly for any markings or labels? I expect you have but have to ask.
You should be able to get it from a plastics supplier/shop/fabricator or a glass shop.
And yes a photo would help. You have left us guessing unless someone has the identical vessel.