Greek fees? LOL! Frats/sororities are for jocks and basic girls … they’re a sucker’s bet.
Move to NY state for a year before their HS graduation, send them to a CUNY or SUNY school. $7000/yr tuition, less with financial aid, and they can find housing for about $1000/mo even in the city if they share. Much less if they go somewhere like New Paltz (beautiful small town in the foothills of the mountains).