[TYPO3-shop] No shipping cost when buying certain amount

[Simon Justesen]

Hi,

I've set up a shop using tt_products (can't remember the version number, 
  but its pretty recent ( from class.tx_ttproducts_pi1.php 3906 
2006-10-11 18:03:26Z franzholz $ )

How do I set up the shop so when the customer buys goods at a price 
below for instance 500 Euros, then there is a shipping fee, but if the 
customer buys for an amount above that, there will be no shipping fee.

Thanks for your help

Best regards
Simon