Rust-Oleum 1 qt. Carbon Gray Varathane Premium Fast Dry Wood Stain at Tractor Supply Co.
Retique It Liquid Wood - Pint Light Wood with Carbon Gray Stain - Stainable Wood Fiber Paint - Put a fresh coat of wood on it (16oz LW, Carbon Gray) - Amazon.com
Stained Wood Stairs; Do they Need a Sealer?
Varathane 8 oz. Carbon Gray Premium Fast Dry Interior Wood Stain 386617 - The Home Depot