All:

I've been dealing with a buyer from Germany and having issues with the fact that the US Post Office is the cheapest route (DHL was over $100 USD compared to $40 for US Post), but the US Post won't ship lithium batteries internationally. Apparently there's a fire hazard on international flights that the batteries have agreed to forego on domestic flights (i.e. it's utter nonsense).

I'll look into DHL again, but when I got an online quote from them it was sky high.