|Should've washed them haha|
This is the cheapest price I have found online, and delivery is £3, or there is free standard UK delivery for orders over £35. Gordon's Direct is a pharmacy so they have lots of other products, as well as other Real Techniques brushes and tools which you could order to bump up the total and get free delivery.
Bargain! Will you be taking advantage of this offer? Do you own any Real Techniques Brushes? What's your favourite?