Finally! A freebie for all of you in the UK:
Something different every day. Today (Dec 2 already) is "Secret Santa: Agent of X.M.A.S" by Guy Bass. (Though, it is not free; it is 99p.) Some of this will be open to those outside the US, but many are UK only. Each item is available for 1 day only. (Dec 1 was a free chapter so you didn't miss out.)
I wish the full Audible.com did something like this. Well, they usually have a Christmastime gift, so hopefully the rest of us have something to look forward to.
Your audiobook bloodhound