Yep you can get a replacement, just apply for one
here. You'll receive an unbranded, holographic Vista disk. When it asks for a VAT ID number you can leave it blank. You'll be asked to type in "Product name as it appears on CD". Here put: Vista Ultimate 64Bit SP1
It costs around £15 and takes about two weeks to arrive. I've used it a couple of times

. I let someone here borrow my unbranded Vista HP 64Bit media but it went missing in the post. They used that website to order me a replacement and it came with SP1, my original didn't.