>>303341819
if you must have FBT at the cheapest cost, then getting a used vive kit and trackers is the cheapest; HTC used to sell refurbished vives at $500 i think, so $800 total.

You can also run a Rift S + two base stations + 3 trackers, for about $960 total. the playspace calibration is kind of annoying but not too bad.

The best set would be index plus trackers, $1300. least problems, index is a good kit overall.