I don't know whether you have to have an Amazon account, but I think not, as I've seen mention of Audible elsewhere than on Amazon.
I have it on my account. For your subscription, you get one credit a month for a free book (your choice from all on their list), and in addition you can buy any others you want from their list. You get to keep all of them, so you can go back and listen to them again. In the description, it says how long the recording is, so choosing a long one is worthwhile in terms of time for your money! If you want to start with a good long story, get "Shrines of Gaiety" by Kate Atkinson (16 hours and 13 minutes)
I find Audible very good, though I must say some narrators are better than others. There is a setting to turn it off after a choice of delays, so if you go to sleep while listening, it won't keep going to the last page while you snore.