Some colleges on the list (Colby-Sawyer, Ithaca…) do not meet need. Run the Net Price Calculator on all of them.
Seconding Questbridge.
Seconding Eckerd if the NPC indicates it’s affordable.
Would he be recruitable at a D3 college for Cross Country or Lacrosse?
Perhaps post on the “specialty” forums → athletes, with a title like “national-level BMX athlete looking for colleges” - this would be a huge hook if a meet need college has a BMX team (he wouldn’t get an athletic scholarship, but with an EFC0 he’d have financial aid in excess of what he could get from an athletic scholarship anyway, and being supported by the BMX team/coach would make admission much easier).