I think your supplier is playing games.
There are no restrictions on shipping Memory cards at all. Yes if the supplier is known to be less than reputable by the shipping companies (ie has had goods inspected before and found to have shipped fakes then will have problems).
There are many carriers who would gladly pick up the load, if they are comming out of hong kong why not just use EMS SpeedPost, ive never had a problem with them, again just depends who is shipping the goods and how.