Amazon offers the San Francisco Bay OneCup Single Serve Coffee K-Cup 80-Pack in French Roast for $19.91. Checkout via Subscribe & Save to cut that to $18.91 and bag free shipping. That's $0.24/cup, $4 under our Black Friday mention, and the lowest total price we've seen. (It's a current low by $11.)
Be sure to cancel Subscribe & Save after your order ships to avoid being billed for subsequent shipments.