My Girlfriend has the Nikon D5000. I want to get her a cheap macro lens that will work with her camera. Doesn't have to be super fancy top of the line. Just something that will take nice pictures of corals. My budget is extremely limited, to say the least. Might be able to squeeze three hundred out, but hopefully less. I know nothing about photography. Can anybody recommend a cheap lens that is compatible or should I get one of those attachment/filter things? If so which one is best? Any help will be greatly appreciated.
Oh, and she already has the AF-S DX NIKKOR 18-55mm f/3.5-5.6G VR, and the AF-S DX VR Zoom-NIKKOR 55-200mm f/4-5.6G IF-ED.