These search engines allow webmasters to purchase positions within the regular search results. Webmasters decide how much they are willing to pay, and are then ranked according to that amount. Webmasters must deposit funds to the search engine, and each time their particular link is clicked by a visitor, the appropriate amount is deducted from that webmaster's account.

Our general advice is to place low bids on a large number of search terms. Paying $2 per click may obtain a high-ranking position, and may attract a lot of traffic, but you may also end up spending more to get those visitors than you can earn from them.

IgniteSearch.com is a great source of affordable targeted leads. Like the other pay-per-click search engines, they provide advertisers with the ability to decide on their placement within the engine, and to pay only when a user searching for their keyword(s) actually clicks through to the advertiser's site. Minimum bid price is 1 cent/click, and the minimum opening deposit is just $10.

AdWords - Run by Google. Results appear on sites which are running the Adsense CPC program.

Big What - Geographically targeted. Bids start at 1¢.

FindWhat - Bids start at 1¢. Minimum deposit is $25.

GoClick - Also pays $2.50 CPM for their pop-under ad program promoting them, along with a search box affiliate program.

GoTo - Bids can be as low as 5¢, and submitted URLs are manually reviewed for relevance to the search terms. There is a minimum spend of $25 per month.

Search 123 - Feeds results to the Search Referral pay-per-search affiliate program.