Posted to an address ...

... in the UK
BUY NOW  1 pot - £13.49 (incl. £3.50 p&p)
BUY NOW  2 pots - £23.48 (incl. £3.50 p&p)
BUY NOW  3 pots - £33.47 (incl. £3.50 p&p)
          - the recommended trial course
BUY NOW  6 pots - £64.44 (incl. £4.50 p&p)
BUY NOW  12 pots - £117.00 (incl. £9.00 p&p)

... On the European mainland
BUY NOW  1 pot - £20.84 (incl. £10.85 p&p)
BUY NOW  2 pots - £32.43 (incl. £12.45 p&p)
BUY NOW  3 pots - £42.42 (incl. £12.45 p&p)
          - the recommended trial course
BUY NOW  6 pots - £73.49 (incl. £13.55 p&p)
BUY NOW  12 pots - £125.50 (incl. £17.50 p&p)

... in the United States
BUY NOW  1 pot - £22.04 (incl. £12.05 p&p)
BUY NOW  2 pots - £34.98 (incl. £15.00 p&p)
BUY NOW  3 pots - £44.97 (incl. £15.00 p&p)
          - the recommended trial course
BUY NOW  6 pots - £77.24 (incl. £17.30 p&p)
BUY NOW  12 pots - £130.45 (incl. £22.45 p&p)

… elsewhere in the world
BUY NOW  1 pot - £22.39 (incl. £12.40 p&p)
BUY NOW  2 pots - £34.88 (incl. £14.90 p&p)
BUY NOW  3 pots - £44.87 (incl. £14.90 p&p)
          - the recommended trial course
BUY NOW  6 pots - £77.94 (incl. £18.00 p&p)
BUY NOW  12 pots - £131.55 (incl. £23.55 p&p)