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What he said. I have a really old-school chrome one that's only 30X and has no light, but it works really well.
You should know that it takes a bit of practice at first with these. Your eye needs to be almost touching it, you know, it has to be really close to your eye. After a few uses, you'll get the hang of it, and how to angle things so the light hits the trichs just right, etc.
Here's a link to one that looks just like mine, for only $12.00
This one's really really cheap ($2.69, free shipping) and works well. It's not really 45x (they calculate for area instead of diameters). There's a 60x for a few cents more.
It's very adequate for looking at trichomes. Works better than one I bought in the $20-30 range.
The optics ain't bad at all for the price. I've had mine for a year or more and I'm perfectly satisfied.