Locked container for transport in a vehicle has a very wide definition. If you just want something cheap that meets the legal definition of a "locked container", go with something like this: https://www.amazon.com/Tenamic-Pistol-Portable-Travel-Handgun/dp/B08FSV8TJS?qu=eyJxc2MiOiI2LjIxIiwicXNhIjoiNS45NCIsInFzcCI6IjUuNjUifQ%3D%3D

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If you want something nicer, elaborate on your wishes & expectations please. :)