Advertise on Google

With the likes of Google you can target users who enter a set of keywords in the search box.

When a user searches for a set of keywords that you have specfied up comes your advertisement with a llink through to your website.

You can allocate a daily spend and then upto that amount your website is promoted.

For example, lets say you allocate £50 per day. For that you get 150 visits to your website and you convert 10% into purchasers. For each purchase you make on average £25. Therefore, with a cost of just £50 you make £375 giving you a profit of £325.

That works out on a weekly basis at £1,625, monthly at £6,500 and yearly £78,000.

Images: 
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Sign up for Adwords online
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Benefits: 

Increased profits.
Attract more customers.