Well, the way I posted in that thread was only for if you had found a picture that was on Google images already.
Another cheap way to post a picture is to post on Craig's list, in a fake 'for sale' thread.
Then you can use that image to post other places, as I described in that thread.
You can make the fake 'for sale' post with a really stupid high price, to keep locals from calling you, and you can cancel the add any time you want.