Amazon offers free delivery for all of £20.00 or over even for non-prime members. I am still a non-price Amazon shopper recently bought a school bag from Amazon worth £16.99. Not surprisingly, it carried £4.95 delivery charge as it was an Amazon prime product.
Being put off by delivery charge, I was looking for a product worth £3.00 to make order of £20.00 for free delivery and then I discovered this brilliant tool called Amazon Filler Checker which let me search for product with the price and category I wanted.
It is a brilliant tool as it helped me make a better use of £3.99 delivery charge.