There are three different shipping options:Hk or Chinese Post Regular Mail $0.00, HK or Chinese Post Registered Mail( comes with tracking number) $2.00, and DHL International Package( says "Shipping to U.S: .25 kg")$22.50. Do they all ship to the U.S. or is that only the DHL shipping? Also do the AK2i flashcarts work on US Ds's.