type in what you want into google
and on the right hand side it normally has links to shops such as price runner etc.
No offence SYL, but thats bad advice.
The links on Google are price per click (PPC) links. The more that you are prepared to pay for a click the higher up the list you go. I used to subscribe to this and did find a big increase in the traffic to my site, but the cost was far higher than the revenue it produced. The only way to fund it was to put my prices up. The highest position on the "sposered links" is no reflection on the quality or prices of the goods or services offered, just a reflection on how much a company is prepared to pay to get the highest placing in relation to the search term used.
As i said, no offence intended.