These:
Not quite as nice a feel as Chessex, but you can't match the value for money. Plus, it's fairly common to actually get 14 or so complete sets.
Tiles are more fun for some than dry-erase.
Also fun are lots and lots of dice.
The Chessex mats are really awesome.
Get it, get it, get it now.
You really can not go wrong with Wiz Dice's pack:
the above is series 2, I bought series 1:
According to the description in the series 2 you are guaranteed at least 15 complete sets. I think when I bought series 1 I ended up with about 13 complete sets and a few uncomplete items.
All the dice are NOT factory seconds so you get useable dice unlike some of the other pound-o-dice that are usually factory seconds. With the factory seconds you can gets dice that are not playable, chips, missing numbers, etc.