How much would you be willing to pay per published guest post?

[ProjectLabs]

Suppose you hired a company that could write and publish an unlimited number of quality guest articles on relevant sites. How much would you be willing to pay for each guest post?

[RankSurge]

I have used some sources where it costs $200 per 950+ word article....

...and they are all ranking well.

Remember, quality doesn't come cheap.

[RobertFisher]

Project#Labs

The key words used here are quality and relevant. For us (we have copywriters on board) as we see our need for more and more blogs, pages, etc. we will likely outsource some of that content. If someone were writing for one of our client sites, say medical equipment sales, and they could write relevant posts of at least 200 words we would likely pay $25 to $50 depending on the sites they were published to and the quality of the article/post. Obviously, the anchor text and links would have to be there as well. 
We do occasionally pay more when we know the writer and have seen quality from them before.

Hope this helps.

Edit (By more, I mean up to $100 per).

[ilyaelbert]

That seems really vague but the rock bottom seems to be around $15/published post on a PR2 blog.