I have used this type of parcel forwarding service. It can definitely get expensive, depending on the size/weight of what you ship, because the shipment is sent priority mail, or air mail. A few of these type of companies use the USPS, where there is no tracking and it can take 2-3 weeks to be delivered to you.
I recently changed to for a US Mailbox. I've ordered a camera, clothes, etc from the states. Bongo offers a lot of added value services like images, live chat, etc. You are responsible for duties and taxes, so just do your research and decide if it's worth it, I would try this link: