Anyone got any high authority blogs I can put a post on?

In which case - why would anyone else want to pollute their own brand by having you promote your brand in their content?

If you want to pay for that - why not use PPC? then it'll show on as many sites as you like.

With all due respect, I think you're going about this the wrong way

First and foremost, I'm not sure many blog owners will accept "prewritten" content. If it were me, I would assume that "prewritten" means "not unique" - and the last thing I would want would be a guest post that's already been published somewhere else, or, at the very least, doesn't fit the style of my blog.

Secondly (and I could be wrong), but the way you've described it makes it sound as if your post will only be talking about your business - almost like an advertisement. If you don't have any solid information and facts to go with it, I'm afraid you will find it very difficult to find a blog owner who will publish it. After all, they're in the business of being a valuable source for their readers - not posting ads disguised as guest posts.

IMO, the best way to promote your brand is by doing some legitimate blog posts. Contact some blog owners in your niche, offer to do a quality, well-researched guest post, and include your link at the bottom so that readers can check your site out if they're impressed. That way, everybody wins. The readers get new information, the blog owner gets a quality guest post, and you get to show off your brand to a new audience.