@ppurus be careful about falling into the trap of picking a school because it offers D3 basketball but outside of that it’s not a match for them academically.
Collegiate volleyball has a strong club level program with conferences and a national club championship.
Just keep in mind that club programs may vary greatly by school from small casual organizations to those that may field multiple teams that actively participate in tournaments etc. As your looking through potential colleges that are of interest, do a little digging into their club programs (How active are they? do they compete in a league?, do they participate in the national championship?) This may or may not matter for your son, but it will give him a lot more options to find a school that is a perfect fit