Yes extension tubes are inexpensive and work fine for the beginner also a reverse lens kit, a lens to camera reversed mount that has filter threads to match up the lens backwards, works well and also is inexpensive - about the price of a set of tubes.
cthahn wrote:
A good macro lens is by far better to start with than to use
extension tubes. A Nikon 105mm/f2.8 can b had quit reasonable if you watch on e-bay. I have had one for over ten years, and is still one of main lenses. Extension tubes cut down of the light, completely change the focusing capability of the lens. There is a considerable amount to be learned and understood about macro photography. If you do not have a good understanding, you will become frustrated.