You don't need a $$$ macro lens unless you are going for very high magnification. As someone stated earlier, if you're going for 1:1 or 2:1 magnification. I have a zoom that does 1:2 that is fine for most things.
As some others have stated, get as close to your subject as the camera will focus (you should be able to find the minimum focus distance in the documentation somewhere) and take the shot, then just use the portion of the photo that you need, it'll probably be more than large and clear enough.
Here's the lens that I use (except mine is the Canon compatible version)
Sigma 70-300mm f/4-5.6 APO DG Macro Autofocus Lens 5A8306 B&H
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten