Another great PPC that I use is Yahoo search marketing. This is because it is fairly cheap and they don't have as strict rules as Google. Your best option for going this route is to make a squeeze page to capture leads. This will give you the most bang for your buck. It doesn't take long to get the campaign going and just take your time, analyze your keywords and delete the ones that are not converting.
Their is many another great PPC options that we use for PPC such as -Yahoo search marketing, Google Ad sense. These options are very cheap, so you try all these PPC options.
everyone recommend adsense but in reality how many webmaster who has very limited traffic actually makes money out of adsesne, as per my experience not many, because they have strict rules, so one small mistake can lead to account suspension, another thing is big minimum payout, which means you have to wait months to see some money coming in, which not every webmaster can do, because we need money to pay hosting expense and all, so waiting payment for months is not an option for everyone, and most of the time webmaster leave or get suspended without reaching minimum payout, so in that case no earning. Thats why I prefer and recommend sites which has very small minimum, getting account approved usually easy and good personal support and fast payment, even if earn less than adsense, still there are many advantages