Hi
Steve and welcome to Mobilread, where you can ask and get answers to all your questions on ebooks and readers.
It's all been said by others above, but I'm an oldie and also like to read general fiction, there are plenty of sources for both free and reasonably priced ebooks. I've a "to read" list of 80 books most of which were free. The ones I paid for averaged $6/7. Just don't expect latest releases to be cheap.
Over the last few months I have had some great reads have a look at
http://www.boydmorrison.com/ who is offering three excellent books for free.
You could also check out Penal colony and Refuge, both by Richard Herley at
http://www.richardherley.com/bookspage.html
And Hal Spacejock book 1 free download at
http://www.spacejock.com.au/ an absolutely hilarious series
All the above authors are Mobileread members.
You don't say where you are, but if in the US there are a number of free books on the Sony store.
Also there are some absolute gems in the 10,000+ Mobileread public domain free downloads.