Hi smange !

I'm a luky Italian boy who received a N900 test unit so ... I can't help you to find a good place or a good price to buy this fantastic mobile phone, but I can tell you that the N900 doen't need a special offer for the data plan becouse it works great with all the Italian operator.
For exempe I use the Omnitel Iphone data plan ( 10 €/month ) and it works great. A friend of my use the 3 umts connection and ... everithink is ok. So ... I think that the first months ( until christmas maybe ) the N900 price will be the same everyware. In the new year I think you will find a discout.
But for the data plan ...use whatevere you want !
I hope to help you.

bye bye