You need to join up and the fees start from $10.00USD. They then give you your own suite number at their warehouse and this becomes your permanent US address. When your goods arrive you can then calculate an approximate feight charge based off the weight
of the item.
Here is the freight calculator link for FEDEX and DHL:
myus2.myus.com/Rates.aspx
If you are not in a rush ask for USPS Air mail. There other services are super fast with Fedex & DHL but this can get really expensive. I would only use these services if its ultra urgent, the goods will arrive in about 3 days using these services. USPS
Air mail can take 2-3 weeks. Just so you know there doesn't appear to be a freight calculator for USPS on the site. I just ask them for it when I get goods. But it is normally like $14-$20.00USD.
The best way to use this service is order all the things you need from the US and MyUS will then store them all for you and pack them all into one delivery. They notify you by email when goods arrive with all relevant details such as cost, weight etc, and
they prepare all the shipping documentation on your behalf for customs and all that. They will mark the goods as "Gift". I have used these guys for year and have never had an issue. Oh and they supply you with all the tracking details for your shipments
as well.
Another site that does this is HopShopGo, its for PayPal members only, but I have not used it. Check em out:
http://www.hopshopgo.com/hsg/welcome.do?l=en&c=