What is the best website for diamond art kits?

The best site is the one that clearly states what you will get. Check four things: a complete kit (canvas, drills, pen, wax, tray), a choice of drill shape, the exact canvas size, and delivery and returns terms written down.

At Diamond Painting Central: over 2,000 designs with round or square drills, dispatch within 2 working days with tracking, €2.90 delivery and 30 days to return a kit.