Amazon offers Jane Austen's Pride and Prejudice Kindle eBook, bundled with Audible narration, for $1.99. (Check the Audible narration box on the product page to receive it.) That's the best price we could find for this digital audiobook narrated by Rosamund Pike.

Note: You can also opt for just the Kindle eBook for free, but as it's in the public domain it can be found for free elsewhere.