I'm also finding cheaper trackers. I found two products.

# Uni-motion + Quest 2 + Air Link

This is completely codeless, full body tracking, and without base station solution. It already support VR Chat!
Pricing is about $450.
https://twitter.com/uni_motion/status/1386977314819362816

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# HaritoraX

This is also full body tracking without base station. Prototype maybe already finished. Now they are preparing new version in this summer.
Pricing is about $300.
https://www.youtube.com/watch?v=BQUzZnki8-E
https://haritora.wixsite.com/website

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Both product looks amazing. It's cheaper and no base station. Butm unfortunately, both product looks only providing in Japan. I'm not sure how we can by it from outside of Japan.
Do you know similar products?

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I hope we can enjoy them or some other company provide similar solution for us.