cobra

What I did !

I ordered parts, not for my Z yet but for a motorcycle conversion which is the same principle as If you were ordering car parts, parts are parts.
I opened an account at the UPS store in Lewiston,NY, it's free.
You pay only by the weight when you pick up your stuff and they will tell you in advance how much it cost, It's fairly cheap like >70lbs = $20.00 charge and there smaller fees for less weight. You get a number when you register and you use it on your mailing address. You get the stuff deliver there and when it's in, they will email you or call but it's always good to call them too. You drive there it's not too far, you pick up your stuff in Lewiston go through customs and declare the amount and the stuff you bought and all you pay is the tax of 13%. Print your invoices to proove what you bought so you won't have any problems, be honest. When I went, I just told the custom agent what he wanted to hear and he didn't even ask for my invoice but I was ready, the key is to be honest and short, that is my experience and it was smooth. There's a lot of other places too around where you can get a US address for that kind of stuff, it's all on the internet, your choice, hope it helps, I didn't read the other replies, cheers !