Not an Apple one but I used a Microsoft Two Button Optical Mouse, designed for a notebook, it's silver and actually a nice mouse. Small though which is fine for me and my dinky hands but someone with bigger hands may feel it is a bit too small. A google search should yield it. Had it two years now and it has worked lovely.
Only downside is it only has a foot and a half long cable
But it's good, good optical mechanism, nice solid buttons, scroll wheel and clicking the latter over a link in safari opens it in a new tab. Recommended if you aren't bothered about Microsoft being on your mouse.
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