Audible

With more than 40,000 hours of audio programs sourced from over 200 content partners, which can be downloaded, burned on CDs and played back on your personal computer, or AudibleReady computer-based mobile devices, Audible is one of the largest and most popular sources of spoken audio. 

The website lets you browse through over 13,000 best-selling audio books and classics from genres as diverse as action and adventure, fiction, business and biographies. 

Listeners on a budget can take a quick look at the below £8 category, which has some of the most popular fiction and non-fiction audio-books at throwaway rates. 

You can even carry your downloaded audio-book with you on your iPod and rejuvenate yourself in the middle of a taxing day. What's more, the website even allows you to purchase products from them, without registering as a member and avail of a discount of at least 30% from the retail rates. 

Buying two or more titles a month also makes you eligible for a handsome 80% discount.