While I was at my mom's, I used a mirror she had (doesn't remember where it came from) that magnified my face SO well I was plucking vellus hairs on my forehead that I NEVER knew were there.

Where can I find one of these for myself? And how much would it cost?

Shaving mirror, prices are variable. Can get them from any homeware store.

Did it have one of those extendable things on it? Could well be a shaving mirror. Light always helps, btw.

You can get the small ones (like a few inches in diameter) that have a suction pad onthe back to stick to your normal bathroom mirror, only a couple of pounds here.