From the web site this is how it works:
Make An Offer
Q. How does the Make An Offer button work?
A. The Make An Offer Button is allocated to products that might be slightly discounted from the recommended retail price. It gives the customer a chance to Haggle on the price and save a few dollars. The customer may continue to haggle until a price is accepted. Once a price is accepted you can no longer submit another offer. You will be directed to checkout or continue shopping. Happy Haggling.
Below is a link to the page with a "Make an Offer' button.
http://www.thetennisshop.com.au/tennis- … ade-V-Jun/
Not sure if its just a bit of a gimmic or realy worth doing.
Too much caffeine.