Hi Andrew,
Hope you are well mate.
You could try Blackmoor Game, Basingstoke.
At the moment they are paying £1.10 (£2.40/Kg) for both Roe and Fallow deer.
Their contact details are:
01420 563831
Best regards, and hope to see you out chasing some Fallow and Muntjac around soon.
Best regards,
Mike.