The new routemaster-style buses will cost £354,500 each.
But Transport for London claims that the final contract, signed with manufacturer Wrightbus, has saved millions of pounds for the taxpayer.
They say the contract "includes a competitive, fixed price deal for the vehicles - removing the risk and uncertainty of higher production and material costs, and inflation over the next four years".
TfL says the price is "broadly comparable with a standard hybrid double deck bus", with the difference "accounted for by the much higher specification of the new bus compared to a standard hybrid bus".
They also claim that the new bus is "the greenest diesel electric hybrid bus in the world".
More top news
The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants