It is available as a Kindle edition from amazon.com for $10.61 US. See
http://www.amazon.com/Silmarillion-J...s=silmarillion . It is also available in a Kindle edition from amazon.uk for £5.89 UK. See
http://www.amazon.co.uk/Silmarillion...s=silmarillion .
Kindle is not pdf format but it is a downloadable format readable on PCs.