If you are not seeing the £10 Amazon price, you need to Select Other Sellers on Amazon or Select New & Used from £7.43
Amazon.co.uk offers The Superman Motion Picture Anthology on Blu-ray Disc for (£10). During checkout, it falls to £8.33 with £3.58 for shipping. This 8-disc set includes Superman: The Movie, Superman II, Superman III, Superman IV: The Quest For Peace, Superman Returns, and over 20 hours of bonus features. 1
This Blu-ray set is region-free and the films themselves will play on NZ Blu-ray players, but note that the extras and special features may not. Also, note that it currently has an estimated delivery date of 10 Nov 2014 - 17 Nov 2014. 2