I own a marketing company on the east coast so offline marketing is my thing.
Sometimes thinking inside the box works also. Certain offline methods are proven effective this one is about door hangers.
If you don't know what door hangers are they are an advertisement that has a hole for slipping over door handles on houses and apartments.
You would be surprised at how cheap you can get these for.
You could use them with anything but I have never tried using them with CPA as I run a legitimate business in the day time.
In most cities have a permit you may have to get but dont fret its no big deal and it will save you heart ache, hassle and fines. If you have townships in your area it might go by that. They usually range in price from $10-$50 and sometimes they are just free.
I bought a six month pass for one area for $20.
Usually they want your contact information and what you are going to be distributing to the area.
This is tough work but it DOES WORK. I say tough work but honestly as a marketer im always behind the desk and I love the opportunity to get out and walk on a nice day and especially if I know it will produce orders.
You can hire out for this (which is what I do). Hire some kids to do it and if you trust them let them do it but I usually follow with my car with water and supplies for them.
Once they do it once, talk them up and tell them how much money you make (fib a little) tell them you will cut them in and will pay a % of sales they make. This way next time you have labor you don't have to watch and you are only having money come out of your pocket if YOU make money.
This method is effective and depending on what you are pitching it can vary in the amount of sales. I sell high end stuff so I usually get 1:200 conversion but that one sale would be worth $1,500.
This could work for CPA offers just make sure you cover your ass legally.
Don't put them on houses with no solicitation signs and watch out for neighborhoods that have one small sign in the front (happened to me before whoops fuck you old man!)
Anyways If you have any questions let me know but for a small investment of $200 and some labor you could make a killing.
You could also offer this as a service like I do and hell, then its just another money system.