Posted to an address ...

... in the UK
BUY NOW  1 kit - £21.85 (incl. £3.85 p&p)
BUY NOW  2 kits - £39.85 (incl. £3.85 p&p)
BUY NOW  3 kits - £57.85 (incl. £3.85 p&p)
BUY NOW  6 kits - £112.95 (incl. £4.95 p&p)
BUY NOW  12 kits - £208.95 (incl. £4.95 p&p)

... on the European mainland
BUY NOW  1 kit - £29.30 (incl. £11.30 p&p)
BUY NOW  2 kits - £48.70 (incl. £12.70 p&p)
BUY NOW  3 kits - £66.70 (incl. £12.70 p&p)
BUY NOW  6 kits - £123.20 (incl. £15.20 p&p)
BUY NOW  12 kits - £220.30 (incl. £16.30 p&p)

... in the United States
BUY NOW  1 kit - £34.45 (incl. £16.45 p&p)
BUY NOW  2 kits - £57.85 (incl. £21.85 p&p)
BUY NOW  3 kits - £75.85 (incl. £21.85 p&p)
BUY NOW  6 kits - £132.35 (incl. £24.35 p&p)
BUY NOW  12 kits - £230.35 (incl. £26.35 p&p)

… elsewhere in the world
BUY NOW  1 kit - £33.40 (incl. £15.40 p&p)
BUY NOW  2 kits - £55.80 (incl. £19.80 p&p)
BUY NOW  3 kits - £73.80 (incl. £19.80 p&p)
BUY NOW  6 kits - £130.30 (incl. £22.30 p&p)
BUY NOW  12 kits - £229.10 (incl. £25.10 p&p)