There are a range of balls available for all standards.
The court temperature also plays a big part in Squash ball selection (In colder temperatures, you may need to use a bouncier ball).
The following Squash balls should be available in your area
Yellow Dot Slow
White or Green Dot Medium
Red Dot Fast
Blue Dot Fast
There is also an Extra Super Slow Double Yellow Dot ball used by professionals or by accomplished players in hotter countries.