After Sight Model 1
You can make your own at home.
If you purchase:
1. A UVC compatible webcam (most are UVC compatible)
2. A Raspberry Pi 3
3. a 16gb mirco SD card
4. an external USB battery (typically used to charge phones when you are on the go)
5. a USB numberpad
6. stereo headphones
Then Download the image file for the raspberry pi 3 on the downloads page and write it to the SD card using win32diskimager.
I did a quick shopping cart on amazon.ca and these came to a total of $87.70 CAD. For under $100 you can have a portable system with image to sound conversion (sensory substitution), object recognition of 1000 day-to-day objects, and a face detection/localization function. You can build this yourself at home in under an hour.