Are the optical shaft encoders still in production?

When I looked on the official website I found optical shaft encoders out of stock. Is this a sign that they might be discontinued? Our team is using them for odometry and I believe many others are.

I see them in-stock right now. If an item is discontinued it will explicitly say this on the page along with something along the lines of available while supplies last - only then will it say out of stock. Optical Shaft Encoder (2-pack) - VEX Robotics