ok, it looked a bit suspicious..
actually, i logged in the new page to ask seller a question (now i have changed both my email password and ebay password to be safe), and he replied me without calling me with my name..
1) I asked him the shipping costs to italy, and this is his reply
"This amp is in great condition, no scrathes no dents, perfect condition i'm in Las Vegas/NV.
The final price would be $1600. including shipping and delivery taxes to your address. Shipping will be about $100 and will take about 3 days via Ups Next Day Air.
The deal will go strictly according to eBay's rules and policy,all you have to do is proceed with the buy it now options and follow the steps. After you will complete the payment steps , just contact me via e-mail . You will receive the item in 3-4 working days .
Thank you and hope to hear from you as soon as possible.
Best wishes"
2) then i wanted to be sure of such a low shipping cost to italy (actually, shipping an half stack to italy should be at least 400 $... 100$ is impossible..!). this was his reply
"Hello there
Yes sir, the shipping cost to your address via UPS Next Day Air will cost $100 dollars to Italy. So if you want to go next with this transaction please click Buy It Now and follow the steps.
Thanks"
and then he told me the way of payment is only through money order...