KCee Might have to be white though as they apparently never have stock of the yellow.
I bought two dozen MTB - X yellow a few weeks ago from their website. I have both in the optic yellow and the white. My current fav balls. I was playing Volvik Vivid in the yellow and orange. Both the Snell and Volvik Vivid "yellow" balls have kind of a greenish tint to them and you can tell the difference from them to most other yellow balls at a distance.
Years ago I played the Maxfli Noodle "Ice" ball a full season. They came in lots of colors. My fav were the bright pink ones. Very easy to see. They also made a grape colored one that you couldn't hardly see in the air or on the ground.