Is there any comprehensive centralised online resource where I can find advanced stats/metrics for free or at least relatively inexpensive?
At a minimum I would like to start with Player Efficiency Rating (PER) or Adjusted Efficiency Rating.
Then ideally I would move onto Box Plus/Minus (BPM), Value Over Replacement Player (VORP) and True Shooting Percentage (TS%). This would be just for the top NCAA players of the previous season who were drafted in the 1st round of the NBA draft.
So far I've looked in:
And of course Sports Reference which only shows the all-time best players in PER: https://www.sports-reference.com/cbb/leaders/men/per-player-career.html
So unfortunately none of these sources have turned out to be very useful, so any help in this would be greatly appreciated! Thanks!