The Raynox is a supplementary lens that clips onto the front of an existing lens:
http://www.bugeyedigital.com/product...ay-dcr250.html
It costs £35 and gives you about 2.5 times magnification with a half way decent zoom. Almost all my macros use it, the one disadvantage is that you do have to work close to the subject, but I've never found that to be a problem. Check out my gallery for examples.