To add and update to the list below that worked for me that brought in good traffic and clients at a very cheap affordable price is zapunited.com
I found this list and added a few.
I hope it helps! If anyone has more to add in the comments that would be great!
Pay Per Click Traffic SourcesGoogle Adwords � adwords.google.com
MSN Adcenter - bingads.microsoft.com
Looksmart � looksmart.com/
7Search � 7search.com
Facebook Ads � www.facebook.com/advertising/
Clicksor � Clicksor.com
Marchex - Marchex : Pay Per Click marchex.com/products/pay-per-click
AdSide � adside.com/
Adblade �
http://www.adside.com/AdSonar �
http://www.adsonar.comPOF Ads -
https://ads.pof.comAdvertise Online Advertising Company : PPC : Email Traffic : Remarketing : Display Advertising :
Online Ads : Pay Per Click Advertise.com
Advertising : Advertise.com
Pulse360 � Pulse 360 - The Leader in Content Targeted Sponsored Links on the Web's Best Sites Pulse360.com
AdClickMedia � AdClickMedia Advertising Network - Pay Per Click Advertising, online text advertising, banner advertising, and Interstitial advertising. AdClickMedia.com
Bidvertiser � BidVertiser - Pay Per Click Advertising On Sites Of Your Choice.Adknowledge � Adknowledge.com | The leading long tail marketplace bidvertiser.com
Admanage affiliate and advertising network - PPC, CPC Banner, In Text, Display Ads, CPV, Domain Parking admanage.com/
AdMarketplace � Performance-Driven Search Advertising | adMarketplace.com
Dojo Ad - www.dojoad.com
Nster.com � www.Nster.com
Pay Per View Traffic SourcesMedia Traffic � Media Traffic - CPV PPV Contextual Advertising
Trafficvance � Trafficvance :: Advanced Display & Text Link Traffic | Home
DirectCPV � Pay Per View PPV Cost Per View CPV Contextual Online Advertising Network
AdOnNetwork � Pay Per Click Advertising | Pop Under Ads | AdOn Network
Lead Impact � LeadImpact
Media Buy Traffic SourcesCasale Media � Casale Media - Home
Valueclick �
http://www.valueclick.comTribal Fusion � Home � Tribal Fusion
Yahoo AdReady - AdReady - Online Display Advertising Campaign Software for Agencies, Advertisers & Publishers | AdReady
Ask �
http://www.ask.com/products/displayIllyx - illyx Network | Affiliate platform Pay per install, impression, click
Advertising.com � Shopping Search | Ask.com
BuySellAds � Buy Ads | BuySellAds
DoubleClick � DoubleClick: The technology foundation for digital advertising
Burst Media - BURST MEDIA
Dashboard Ad - Dashboard Ad
Adengage - AdEngage - Engaging Internet Advertising
CPX Interactive - Welcome to CPX
Undertone - Undertone
Ad Pepper - ad pepper media: Home
Pay per textInfolinks � Pay Per Click Advertising - In Text Ads for Websites by Infolinks
Kontera � Kontera50onRed � Performance is Paramount | 50 on Red
Vibrant Media � Vibrant - The Leaders of Contextual and In-Text Advertising
Linkworth � LinkWorth | Search Engine Marketing - Text Link Advertising
Inlinks - inLinks - In Content Link Market Place
InText � InTEXT SYSTEMS (wwwserver2)
Mobile Traffic SourceAdmob � Mobile advertising with AdMob: mobile ads for apps ? Google Ads
Jumptap � Jumptap | The Leader In Targeted Mobile Advertising
inMobi � InMobi | Global Mobile Ad Network
Adfonic � Adfonic
Mojiva � Mobile Advertising with Mojiva's Mobile Ad Network
Mobclix � Mobile Advertising, App Advertising and Analytics, Mobile Ad Exchange, Mobclix