Build your own bundle!
Buy 3 = £6 plus £3.99 postage is £9.99 (£3.33 each)
buy 4 = £11.99 (£3.00 each)
buy 5 = £13.99 (£2.80 each)
buy 6 = £15.99 (£2.67 each)
and so on ......