Cheap way to get Amazon Echo Dot for only £15.98 directly from Amazon
All you need to do is sign up to Amazon Unlimited Music (Family Plan). Sign up to the 30 days free trial so you will be charged £14.99 for the first month. Within a week of the trial ending you will receive an email from Amazon on how to get the Amazon Echo Dot for £0.99.
Make sure to cancel the trial before the 2nd payment is taken from your account. In the meanwhile you can enjoy free unlimited Amazon Music.