Cheap alternatives to limelight?

Our team is fairly low budget, so limelight 2 is totally out of our price range. I was wondering if anyone knows about any alternatives out there?

Cheapest ($20): USB camera plugged directly into RoboRIO, do image processing if desired in robot code:

Fairly low cost (<$80): Raspberry Pi with USB camera or Pi Camera

Thanks, will look into it!

Halfway in between is the Jevois

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