For around $40,000 you can be the proud owner of this aerodynamic, World War II 1940 Humber Hexonaut GS 6×6 Amphibious Prototype. Whew, that was quite a mouthful:

1940 Humber Hexonaut GS 6×6 Amphibious Prototype

Please note that this is not an early Hummer, but a Humber.