April Fools Day Books
ISBNs for april fools day fiction
And then, while exploring April Fool's Day information on Google, I found this site Isbn.nu. I still haven't found out what .nu means. This looks like an interesting site to work with some acquisitions, especially if you are after out of print material. Actually, the owners say,the purpose of the site is to provide price comparisons for in print and just out of print books without additional ads. I really like the clean search page.