3 products fixed price

[2cool]

Is it possible to create a fixed price on every 3 products in 1 category...
1 product = 3,50
3 products = 10,00
also for next 3 products

Is it possible in vm 3.0.4. or use plugin?

Thanks you,

Pas

[jenkinhill]

Maybe use http://extensions.virtuemart.net/all-tutorials/10-calculation-rules/11-quantity-plugin