Posted to an address ...

... in the UK
BUY NOW  1 pot - £14.59 (incl. £3.60 p&p)
BUY NOW  2 pots - £25.58 (incl. £3.60 p&p)
BUY NOW  3 pots - £36.57 (incl. £3.60 p&p)
          - the recommended trial course
BUY NOW  6 pots - £70.54 (incl. £4.60 p&p)
BUY NOW  12 pots - £128.70 (incl. £8.70 p&p)

... on the European mainland
BUY NOW  1 pot - £24.04 (incl. £13.05 p&p)
BUY NOW  2 pots - £35.03 (incl. £13.05 p&p)
BUY NOW  3 pots - £46.02 (incl. £13.05 p&p)
          - the recommended trial course
BUY NOW  6 pots - £80.87 (incl. £14.93 p&p)
BUY NOW  12 pots - £138.81 (incl. £18.81 p&p)

... in the United States
BUY NOW  1 pot - £27.05 (incl. £16.06 p&p)
BUY NOW  2 pots - £38.04 (incl. £16.06 p&p)
BUY NOW  3 pots - £49.03 (incl. £16.06 p&p)
          - the recommended trial course
BUY NOW  6 pots - £85.93 (incl. £19.99 p&p)
BUY NOW  12 pots - £144.98 (incl. £24.98 p&p)

… elsewhere in the world
BUY NOW  1 pot - £27.62 (incl. £16.63 p&p)
BUY NOW  2 pots - £38.61 (incl. £16.63 p&p)
BUY NOW  3 pots - £49.60 (incl. £16.63 p&p)
          - the recommended trial course
BUY NOW  6 pots - £86.62 (incl. £20.68 p&p)
BUY NOW  12 pots - £146.65 (incl. £26.65 p&p)