Where do you get a Thunder Stone in Black and White?

Question

I have some Eevee' s and I want a jolteon so where

Answer 1

Non-repeatable
- Chargestone Cave (B1F, west of Team Plasma)
- Shopping Mall Nine (Given by the Worker at the top)

Repeatable
- Dust clouds
- Black City (From Ken for $10,000)
- White Forest (Gift from Ken)

Thunder Stone (Bulbapedia)

Answer 2

Dust clouds, (in caves) Shopping Mall Nine, Chargestone Cave, and Black City.

Source

Answer 3

>Route 9, Chargestone Cave, Wellspring Cave (Dustcloud), Chargestone Cave (Dustcloud), Mistralton Cave(Dustcloud), Twist Mountain (Dustcloud), Challenger's Cave (Dustcloud), Victory Road (Dustcloud), Giant Chasm(Dustcloud)
You can buy it from Black City also
There is a Pikachu Event that got Thunderstone also

Source experience