Where and how to buy advertising space? for traffic and conversions!

Where and how can i buy advertising space on a website that is highly ranked and related to my niche?? weight loss niche.

As a experiment, i will to create a one page review site of a poplar weight loss product, then market it by creating an ad and buying ad space on highly ranked websites with a fair amount of targeted traffic.

Budget of around $200-$400 a month.

Where is the best place to buy advertising space, is there a marketplace for it or should i contact websites privately??

 

Contacting webmasters privately makes the most sense, and I think that you will get the best results this way if you do your research. However, there is also buysellads.com, advertisespace.com and other sites like that.

 

Thanks, yeah i don't really trust those two websites, they look like a waste of time for buying ad space.

 

I have used buysellads.com and it was legitimate. You get what you pay for though. I also believe that contacting webmasters directly is the best route.

 

Do some keyword researches to find the best keywords and sites that you should buy ads from. Buy ads on those sites by targeting them through ad networks.

Don't buy ads directly from webmasters before buying ads through ad networks especially if you need conversions.
You need to know your average cost per conversion before trying to find the best method. So you should try all the methods in the long term but you should start with the safest method.