Example: If you get 20000 visitors per day and total of 40000 page views and you are getting CPM rates of $2 then you earning can be – 40000/1000 = 40 CPM x $2 = $80 per day.
Amazon CPM
The Amazon Affiliate program is of course the grand-daddy of affiliate programs. In mid-2015 they launched a CPM advertising program "that enables you to show ads from Amazon and other premium advertisers on your web site(s)."
Joining the program of course requires first joining the Amazon affiliate program.
BuySellAds
BuySellAds is a network through which advertisers can buy advertising space on your site. There are two payment models for an advertising zone: a) Pay per month, b) CPM, which you select when creating the zone. An advertiser will pay you in the model configured in the zone.
For either the pay-per-month or CPM model, you set the price. Advertisers browse the BSA website to view available websites. The advertiser requests permission to display advertising on your site, and you must approve (or disapprove) their request. If an approved advertiser wants to change their ad, you're asked to approve (or disapprove) the change.
It's free to join BSA. They review and approve your website before allowing you to display advertising. One key attribute before your site can be approved is a minimum 50,000 page impressions per month threshold.
Propeller Ads
Propeller Ads is an advertising network that uses a CPM payment model. It appears to be free to sign up, but that there's an approval process before you can run advertising.