BBs are okay. Only problem is the costs of shipping are ridiculous compared to the value of bbs, especially via airmail. It's kind of like shipping a bag of gravel. Customs may inspect your bag of beebs to see if it's a big sac of extascy, but they prolly wouldn't seize them.
My bb shipments are regularly inspected (some bottles are opened), but never seized.
Want nearly free GBB gas?