I stayed inside the South Rim at Maswik Lodge 3 nights last year, Nov 30-Dec 3 (Wed-Fri), and paid $78 per night including taxes, booked on Cheaptickets with a 20% off coupon.

I didn't realize at the time of booking, the last day Hermit's Rest (Red) Route runs is Nov 30. That won't affect the OP, but I thought I'd post that for future readers. You can find the bus schedules here: https://www.nps.gov/grca/planyourvis...ttle-buses.htm