how to apply discount based on products quantity of some category

[mignonnette]

hi,

I have found a extension to set discount based on single product quantity, but i hope to set discount based on category. But what I need is something like that:

I have a product category c1 and in which category there are 10 products p1 to p10. Any single product cost 10. If add to 2 any products of category c1,such as 1*p1 + 1*p3 or 1*p4+1*p7, I hope the total price goes to 15 instead of 20.

Are there any suggestion how to make this happen?

Thanks in advance

[joommasters]

You can try JMS quantity related price plugin:
http://www.joommasters.com/index.php/joomla/joomla-plugins?view=document&doc_id=21