What PPC program do you currently use? Does it work well?
I use MSN Adcenter and Adwords. I turned Yahoo off 2 years until they get their act together.
I use Adwords and it works very well.
If you want to graduate to what the big boys use you could try media buys, some of them have various accounting methods. Some spend thousands a day on these services, but uou can start with $100 to $200 min buy.
Advertise.com text and display ads, $100 min. good quality traffic
Clicksor.com cpc ads delivered in a variety of methods. $100 min.
AMPKeywords.com a smaller cpc text ad network, $100 min.
Pulse360.com High quality cpc text/display ad network , $100 min..
AdBuyer.com cpc.cpm bid text/display, has access to Google's ad network $200 min.
AdBrite.com text and display ads, $100 min. cheap ads, lower quality network, tolerating more diverse advertisers, cpc may be a safer bet with them, watch where your ads are placed.
I use adwords currently and works very well for me.
Google adowrds is the best PPC network.I am currently use it and i am much satisfied with them.They charge normal rate along with good ads.
its really awsome with a min. payout of $10
and min. cpc of $.025