If you get asked by Chelsea friends to buy them tickets be very careful. They might be great guys, but if there was any trouble (cheering a Chelsea goal) they could be thrown out, the purchaser of the ticket would be traced & you could end up getting a ban from Selhurst

Also, normal advice for selling tickets - expect a large number of new members so check their history

Trivial fact - Palace used to win 5-1 at least once a season, maybe next season?