Corian is a great product for showers! As is other solid surface like Swanstone, Hanex, Formica Solid Surface, and all of the rest of the solid surface manufacturers. Although it starts at about $50 a square foot, it goes up to over $100. The custom shower pan is usually 2-4K. It depends on the brand, size, and details. Most solid surface showers that we have done have been 8-16K, which is about the same as tile would be.
The real advantage over tile is the calm seamless look. It can be slipperier than tile, but that is easily addressed by sandpaper.
It is a common misconception though that these are ”easier” maintenance than tile. The maintenance is exactly the same. If you have hard water, treat it. Squeegee them after use, and clean weekly with a neutral cleaner and microfiber cloth or mop. If any soap or skin cells remain, they will provide a medium for growth for yucky stuff. If they do not dry out, that fosters mold. Clean them, dry them, and either solid surface, or tile, is fine.
Q