Bookie offers for Manchester Utd v Manchester City on December 10th.
Corals
Place a £5.00+ win single on the 90 minute match betting market and if your team wins both halves Coral will double your winnings up to £50 in free bets.
https://bet.coral.co.uk/#/promotions/doubleyourwinnings
Ladbrokes
Place a £5.00+ win single on the 90 minute match betting market and if your team scores 3 or more goals Ladbrokes will double your winnings up to £50 in free bets.
https://m.ladbrokes.com/en-gb/#!promotion?promoId=69
10 Bet
Place a £10.00+ win single on the 90 minute match betting market and if your team wins to nil 10 Bet will double your winnings up to £25 in free bets.
https://m.10bet.co.uk/promotions/manchester-derby-special/#manchester-derby-special
Any more specials if you find them post in the comments.