Stick to "plug" traffic at
Plug Rush
few others that sell actual "clicked" traffic...
Traffic-Out
Juicy Ads
Buy FPC Traffic
install analytics, run your campaigns for a month, log in to each traffic source and then block all the 0.00 second visitors with 100% bounce rates. Blind/Skim/Popunder traffic can work but takes quite a bit of monitoring/blocking to grab the best. Quality is usually the highest on actual clicked traffic (reason it's priced higher as more targeted) so less blocking needed.