That's 40 to 1200 click-throughs per month, depending on the nature of your site and the type of preferred listing you choose. That's far more cost effective than most banner ad programs and most other forms of advertising. Prorated refund after that. Summaries emailed monthly. You're satisfied or you get your money back.
Search terms are categories, brand names, product names, model numbers, etc.
Large sites include up to 1,000 search terms with their listing. Search terms are not displayed anywhere, but they cause buyers to see your listing whenever their Buyer's Index search includes those words. Buyer's Index lists high quality directories and search engines that help mail order buyers in specific areas. For example, a directory of photographic equipment merchants, or a directory of long distance phone companies. The directory or search engine must be nationwide or worldwide in scope.