Lots of surplus mess tins out there. https://www.amazon.com/Original-Stainless-Cooker-Genuine-Military/dp/B07NWG6FWF
https://www.varusteleka.com/en/product/french-m52-three-piece-mess-kit-aluminium-surplus/68400
https://kommandostore.com/products/yugoslavian-mess-kit