at any "Christmas Tree Shops" $34.00 for 12 SQ Feet box. Its really easy to install in all cases. Tools and stuff needed:
1. Any piece of cardboard that will be cut to the pattern you need.
2. Saw! Lay the cardboard on top of the tiles once snapped together and trace the pattern and cut the pieces that need cutting.
3. Un-snap the pieces and re-snap in the location you selected.
Yes... Your done! Note: The bottom is black fairly thick plastic that allows proper drainage!