Ebooks - 20,000 Words Each - $40 Each - USA, UK, Writers IV

Hey, I have a few ebooks I need written. I'll pay you $40 for each book. The books need to be informative and don't contain fluff. They have to be error free or you don't get paid. No escrow. Only PayPal upon completion. The books will be 20,000 (twenty thousand) words each. Only native english speakers please. I will need one book every 4 days, so 4 days for each book is the deadline. Thanks.