1 unit £24.99 (including postage and barcode)
2 units £45.98 (including postage and barcode)
3 units £68.97 (including postage, barcode and 1 free = 4 units)
4 units £91.96 (including postage, barcode and 2 free = 6 units)
5 units £114.95 (including postage, barcode and 3 free = 8 units)
6 units £137.94 (including postage, barcode and 4 free = 10 units)