B&H has a used Canon RF 100-500mm L IS USM Lens (10-rated, save $290.00 vs. new), along with used RF 50mm F1.2, RF 24-105mm F4, and RF 16mm F2.8 lenses, in stock.
Learn more:
Canon RF 100-500mm F4.5-7.1 L IS USM Lens Review
Canon RF 24-105mm F4 L IS USM Lens Review
Canon RF 50mm F1.2 L USM Lens Review
Canon RF 16mm F2.8 STM Lens Review