Many good ideas above. Another suggestion is Muhlenberg College which is a LAC with a business program and is D III. Also, Bentley is D II and may be worth a look if that is a suitable level of play for him (I don’t know the difference between D III and D II ).
It might be a good exercise to go through this list and see what schools seen appealing and research those further. https://en.wikipedia.org/wiki/List_of_NCAA_Division_III_institutions
@4Gulls I love Fordham (my S went to Gabelli and had a fantastic expereince) but the OP is looking for D III schools and Fordham basketball is D1 and is part of the very competitive Atlantic 10 league (not the Patriot League as it is for many other sports).