Posted to an address ...

... in the UK
BUY NOW  1 kit - £21.35 (incl. £3.35 p&p)
BUY NOW  2 kits - £39.35 (incl. £3.35 p&p)
BUY NOW  3 kits - £57.35 (incl. £3.35 p&p)
BUY NOW  6 kits - £112.45 (incl. £4.45 p&p)
BUY NOW  12 kits - £208.45 (incl. £4.45 p&p)

... on the European mainland
BUY NOW  1 kit - £29.30 (incl. £11.30 p&p)
BUY NOW  2 kits - £48.80 (incl. £12.80 p&p)
BUY NOW  3 kits - £66.80 (incl. £12.80 p&p)
BUY NOW  6 kits - £123.30 (incl. £15.30 p&p)
BUY NOW  12 kits - £220.45 (incl. £16.45 p&p)

... in the United States
BUY NOW  1 kit - £30.20 (incl. £12.20 p&p)
BUY NOW  2 kits - £52.40 (incl. £16.40 p&p)
BUY NOW  3 kits - £70.40 (incl. £16.40 p&p)
BUY NOW  6 kits - £126.90 (incl. £18.90 p&p)
BUY NOW  12 kits - £225.50 (incl. £21.50 p&p)

… elsewhere in the world
BUY NOW  1 kit - £29.75 (incl. £11.75 p&p)
BUY NOW  2 kits - £52.15 (incl. £16.15 p&p)
BUY NOW  3 kits - £70.15 (incl. £16.15 p&p)
BUY NOW  6 kits - £126.65 (incl. £18.65 p&p)
BUY NOW  12 kits - £225.45 (incl. £21.45 p&p)