Tickets for Arsenal's Premier League match against Chelsea at the Emirates are being sold online for up to £950.
The game between the two London clubs on 26 April is officially sold out but tickets are being sold on exchange websites.
It could be a potential title decider between the current top two teams in the league.
Tickets at the Emirates for category A matches such as the Chelsea game cost up to £97 on the official website.
Arsenal's match-day tickets are the most expensive in the Premier League.
One website is selling a ticket in the Chelsea section for £950, with the most expensive ticket in the Arsenal section going for £712.50, an almost 700% increase on the normal price.
Arsenal are second in the league, seven points behind leaders Chelsea, who have a game in hand.