Due to delivery charges constantly going up we have had to increase the cost of the 10 x refills. However, we have now added to the buy online page a special price of 20 x Blockblaster Refills for £14.99. This makes a saving of £4.99 and having a nice stock of refills at home. Be sure to take up this offer, as don’t forget each refill does the same job equivalent to a bottle of nasty corrosive chemicals. Happy Blasting!