Nice one. I imagine you you’re looking at $2500 - $25,000 depending on how long you’re willing to wait. Estibot estimates the value at $166,000 while GoDaddy estimates $18,353.
Short popular English .co is in high demand, it can sold from low xxxxx$ to high xxxxx$. Consider to use broker like Grit Brokerage or Tracy's Enaming.com. Some good domains sold like leaf.co (89k), Mojo.co (85k), versus.co (75k) are brokered by Grit Brokerage.