I'm offering a basic PaidToPost service on my forums, I did this method once before, then stopped due to some issues, they have all been fixed now and I've started the service again!
100 posts/topics = $5 (PayPal)
You may be thinking, wow that's a lot, but it isn't, really. This site is a general discussion site meaning you can talk about pretty much whatever you want, it's not limited to one particular subject/topic!