Mupp
I am in no way affiliated with helobooks.com but did look at buying exactly the same books as you from them when I was over in the States in August. In the end I bought them from helicoptersonly.com since the shipping time to my brother's place (where I was staying) was shorter (east coast vs. west coast).
I did get my brother to phone helobooks.com, probably about a year ago, to check on the cost and feasibility of shipping the books to South Africa, where I live (an option I chose not to use in the end when I discovered I would be travelling to the States this year). He managed to get hold of them using the telephone number from their website. Bear in mind that helobooks.com and mojavebooks.com appear to be one and the same thing.
Contact details cut and paste from mojavebooks.com website:
Mojave Books LLC
P.O. Box 735
Mojave CA 93502-0735
661.435.1100 <---- Phone number
(fax) 866.742.8428
email:
[email protected]
I'd suggest using Skype and try call them during their office hours, bearing in mind the 9 hour time difference between Sweden and west coast USA.
Cheers
Turbinefan