If you are using your PPC to send traffic to a site of some sort with the offers on then you are free to use Yahoo, MSN or Adwords but if you want to try something out before spending a load of time building the sites then heres a great tip...

Set up a Yahoo (USA) account if you don't have one already (another tip is to search for Yahoo Search Marketing Coupon on Google if this is a new account, there's some $75 free credit ones out there....) and then direct link to the offer.

Yep, direct linking actually works when it comes to PPC to CPA. I personally think it is because most of the time you aren't asking someone to part with a lot, so it takes less convincing to get them to fill in the info you need. When it is a large amount to pay out they like to read some more reviews and make sure they are ready to part with the cash, but when it is $1.20 for some S&H they don't really need it.

This isn't to say that it doesn't work to go to a site of your own first, it can really boost the conversion, but when you are just trying out an offer to see if it sells then this is a great, quick way to check it out.

Set up the account as normal and when you are setting up the advert offer you can just use the main URL of the offer page as the display URL (you can find this by viewing the preview on the CPA network e.g UltraTeethWhite.com) and your affiliate url (which you will find inside the campaign) as the actual url and it works just great.

Once you find an offer that converts I suggest making a site or at least a landing page around it to take it to the next level, but for now read on for some tips on grabbing keywords for your PPC...