Yes, I NEVER write articles, not even articles for my website. I have used many people from oDesk. Now, you need to take some time to find good ones that are cheap. But if you do enough work, I can tell you that you can find people who can say an original article and rewrite 5 to 6 sentences, all within spintax (or you can have them do it line by line and then use the Takeachance Spinner hybrid). All that can cost less than $ 10 for a VA with pretty good English.
I've spent hours (looking for people, training them, etc.) and spent thousands of dollars on odk. You just need to take some time to find good ones. It is not easy, but it is possible. There are tons of people in oDesk. Some charge high, others charge low.
So, if you are in this for a long time, I recommend that you spend a little time in Odesk, if you lack money and you can not spend too much. You can get good offers there. But you need to train them and spend time with them. But if you do not have time, there are services available where you pay more but you do not have to devote so much time to training and everything. It may be worth it, depending on how much your time is worth