>>289112384
You can get IMU breakouts from sparkfun or adafruit for ~$30, they're pretty good for orientation, and if you solder yourself I'm sure you could get the IC for cheaper. positional tracking is still hard though, no IC for that. there's the hivetracker project to make cheap DIY lighthouse-based trackers, but given that i've never seen anyone build one, I doubt it's practically usable.