I found this today. Its a blog that takes you to a link where you can sign up to a 30-day trial and get 5 free images (any size) per day. After that you pay $4.95USD (about AUD$6.70) a month for the same deal. I’ve signed up and am making use of my first 5 images already. You don’t have to sign up to search the images though, so you can see if there’s anything you want before joining.
I’ve made the link to the blog rather than directly to the page as the author (couldn’t find a name on the page and the rest of it is in a language I won’t pretend to know) sums it up more succinctly than I could.
But, for those of you who just want to go straight to the site…
Happy writing and may the self-publishers among you find something interesting!