I don’t think many people will share their best places to advertise, I know a lot of people have good sites where they are getting a lot of customers from, a niche community normally works very well.

A lot of people have great success with adwords, but you really have to find good keywords, you will probably end up spending a fortune before you find your own niche on adwords.

You won’t even find the name of a lot of your competition on google adwords because they are going for a niche, you normally wouldn’t find it just by typing in their company name.

If you know who you are targeting, you won’t really have a problem finding sites to advertise on, you just need to know how much sales are worth to you.
A lot of people don’t put the right value on their sales.