how do i move weapons from blender to unity?

It's possible to export models in Blender and then import them in Unity. It's not possible to move weapons from blender to unity (that doesn't even make sense). "or if that isnt even possible what are free OR cheap" what the heck are you talking about? what is free or cheap...love, sunlight, penny sweets and items on sale are free or cheap. Are you asking where to buy or find assets such as cars and weapons or are you asking how to use them in unity? Try making sense, I can only assume what you want and leave you with an open ended answer like this one, which gives you a basic idea but overall could be more helpful. (just like your question!)