If you like to do puzzles, this is a great accessory. I just bought one for my mother who likes to do puzzles daily.
It includes six trays that can be stacked together when you want to move the puzzle or make more room.
The six trays are handy for separating pieces by color making it a lot easier to finish larger 1,000 piece puzzles.
This is a great gift for anyone who likes puzzles and runs around $10-15 depending on where you buy it. It is currently $10.74 on Amazon with free next day shipping.
If you do puzzles frequently, I recommend also building a large build board. This is simply a thin piece of particle board with a 1/2" heigh & 1/2" wide wood border that keeps the pieces on the tray. You can make these yourself pretty cheap and easily.
These trays also make it easy to work on puzzles together, each person can have a different tray to work off of and can easily pass them around as needed.
You can pick it up on Amazon for $10.74 with one-day shipping.
All images are from Amazon product page