According to The Sun, website room110.com has agreed a sale price of $70,000 – or £44,340.97 – with the unnamed seller.
The video, which was posted on gossip website tmz.com last December, shows the Disney star, 18, inhaling smoke from the device before behaving strangely.
She is seen giggling uncontrollably before declaring: “I’m about to lose it now… I’m having a little bit of a bad trip”
Then she begins mistaking one of the men in the room for her boyfriend Liam Hensworth, saying: “Is that a f****** Liam lookalike or what the hell is that? Is that my boyfriend?…Is it me tripping?”
A spokesperson for the singer insisted she had been smoking salvia, a herbal hallucinogen legally available in the US and Britain.
Since the video was leaked sales of salvia at ‘headshops’ around the US were reported to have rocketed.