Merit awards at Oberlin go up to low 30s/year. Grinnell, last time I checked, maxed out at 25K/year and Macalester was 20K/year (might have gone up, but not more than Oberlin’s max).
Other schools mentioned up thread offer more than 30K/year and up to full tuition: Wooster, Denison, Centre, Rhodes, Muhlenberg, St. Olaf, Beloit, St. Lawrence are among them, although the last three feature long, cold winters! Denison is increasingly competitive for the big awards.