I use the cheapest of USB microscopes available on Amazon. (20 bucks or so). I find you have to shield the LED lights, or at least some of them, with your finger or a business card while taking the pic. Otherwise you get so much glare you can't tell anything from the photo. Also, if needed, I adjust brightness/contrast with Gimp (free image software) before uploading.
You can see the edge of the envelope I used to shield the light in the pic.