Final figures on the legal aid granted to fight Mr Bain's case were released yesterday, when the case was finalised in the Christchurch High Court.
The $2,056,495.57 was paid to lead provider Michael Reed QC for legal services for Mr Bain at his retrial, and covers the fees, travel and accommodation of Mr Reed and his legal team.
Prior to the second trial, legal aid paid to lawyers acting for Mr Bain totalled $706,127, including legal aid for his original trial ($149,000), his appeal to the Court of Appeal ($101,000) and 2007's appeal to the Privy Council ($455,700).
To date, the Crown has paid $142,356.53 in fees, travel and accommodation for witnesses and payments for video links to witnesses.
There are more costs to come.
A Ministry of Justice spokesman said the department was unable to be more specific on when a more final total might be available.
The costs included those of police officers attending the trial, although the ministry did not pay for police officers who were witnesses, to attend the trial.
The ministry was unable to provide a total cost for the Bain trial due to the way it kept financial data - it did not keep running costs of individual trials.
The officer in charge of the police operation to bring David Bain to trial a second time, Detective Inspector Ross Pinkham, said Operation Huia, as it was known, had cost police $420,000 since the Privy Council's ruling in May 2007.
The cost included travel and accommodation for police staff who travelled to Canberra, London and Melbourne; to and from Dunedin, Christchurch and Wellington for pre-trial hearings, and those who were based in Christchurch for the nearly four months of the retrial.
It included the cost of printing photos and pamphlets, setting up digital files and support staff who organised the travel and accommodation of 130 Crown witnesses.
It also included the cost of transporting the police evidence to Christchurch, where Dunedin staff took over a room on the 12th floor of the Christchurch central police station.
Police staff wages were not figured into the total cost to police.
At its peak, 27 staff worked on Operation Huia in one week, but staff had ebbed and flowed around a core team of seven for the past two years.
Much of the work at the start was putting evidence from the first trial into a digital format compatible with today's technology, Det Insp Pinkham said.
In the end, the police Bain case file included 2943 photos taking up 62.6 gigabytes of space, and more than 15,000 documents, which took up 23.7 gigabytes of space.
Thirty-three police staff were called as witnesses at the retrial for the murders.
