Do you want your very own Plasma Rifle? Then replica maker TriForce has just the thing for you. For $600, you can buy either the blue och the red version of it and each version will be limited to 500 pieces each.
Here you can make a reservation för the blue Type-25 Directed Energy Rifle (as it's called by UNSC) and here's a link to the red Type-25 Directed Energy Rifle/J.