Warcraft 3: The Frozen Throne

Does any one know how i can find a free download expansion to war craft 3 the frozen throne. with out haveing the cd just the RoC cd (reign of chaos)

The Frozen Throne is old, but not free yet.
The digital download at Blizzard is $19,99/€14,99.

Retail box prices of the budget version beginning at 14$/9€.