For the true collector, simple acrylic dice are perfect for rolling across a table, but nothing compares to specialty dice. They can be fun to look at as well as a terrific conversation piece.
Carved: Amazon.com is an excellent source for dice, and they offer a wide array of carved dice. These are made of resin, and have intricate patterns carved in them with numbers in the style of Elvin writing.
Metal: RPGShop.com has an impressive assortment of Metal D&D dice available. Chrome, brass, pewter, aluminum, and more.
The thing to remember about metal D&D dice, is... they're made of metal. They're heavy. Be careful when rolling these, they will chip glass table tops, and they will leave dings in wooden tables.
(If you're like me, you sometimes find yourself spinning your dice like a top. Nothing compares to a metal D&D die, these things spin like crazy and for a very long time!)
Gemstone: FRPgames.com has a wide assortment of dice cut from gem stones like amethyst, clear quartz, opal and more.
These dice, while fully functional are rather expensive and should be cared for. These are probably not the best choice for young players or die spinners like myself.
With ...soap?: Geekyclean.com is the perfect stop for you to buy your basement dwelling teen a bar of soap, and a new d20. Your teen will thank you, and so will his friends!