I have placed several orders from California with two AC distributors (unfortunately neither are in biz anymore). If your building a full on AC rig you will have little difficulty in justifying a 35 Euro postal fee as you will probably easily be up in the $500 range. However, I would suggest you get "premium" shipping as what AC calls DHL is not the DHL you are familiar with in the states. DHL in Germany is essentially equal to the USPS and in fact the USPS will deliver your products. The down side is that your parts may sit in customs for several weeks here in the USA. Pay a few more $$ and have it sent via UPS or FedEx and it will flash right through customs.
I tried to get Gary once to order a bunch of stuff for me, but he didn't seem to interested. Perhaps there were minimum orders per item or something like that. Also what I was ordering he figured he would never be able to sell (low flow) here in the states. Dunno perhaps he might be able to add your order on to his. Give him a ring or email.
Good luck on your AC build and post a pic here for our edification.