Shipping fees were included in Lend-Lease. Pre war the Australians found the round trip freight charges for 40 Avro Ansons Chartered by the RAAF were expected to be 45,000 pounds, with the Australian version of the pound worth about 75% of the British pound. The pre war RAAF order for 50 Hudsons plus some fittings plus 12 spare engines plus freight $4,912,300 of which $163,230 was freight, the engines were $15,000 each. Additional "Appendix A" equipment from Britain was 90,000 pounds plus 9,000 pounds freight.
As of 31 May 1941 monetary amount for spare engines per aircraft in pounds was 1,750 Lancaster or Halifax, 450 Spitfire V or VI, Mosquito, 600 Spitfire IV. Spare engine cost is NOT for one new engine, rather an allowance for 1 spare engine per X new aircraft, the cost of the spare engines ordered divided by the number of aircraft in the order. It meant 850 Spitfire fighters with spare engines cost 9,950 pounds each, 150 of the reconnaissance version 11,100 pounds each. The Mosquito order 18,950 pounds each, the Lancasters 43,150 pounds (Armstrong Whitworth) 45,350 pounds (MetroVic), Stirling 52,300 pounds, Wellington 27,100 pounds. (Warwick engine allowance 2,000, Stirling 2,500 pounds)
As a comment on different manufacturers and order sizes, Sunderland without spares, Short 50 aircraft 52,100 pounds, 25 from Short and Harland 60,100 pounds each.
British Archives AIR 20/1981 has the Hurricane at approximately 8,000 pounds each in April 1942, 21,000 pounds for a Beaufighter, and the Kittyhawk price, including freight from the US, as approximately 15,500 pounds, the Airacobra 16,700 pounds and Havoc 39,500 pounds.
Pre war 1 Spitfire plus spare Merlin to France, 16,500 pounds, price quoted for 15 Spitfires for Turkey 13,000 pounds each, the ones sent in 1940 were priced at 11,700 pounds.