I'm in a similar situation. Lots of dealers have extremely poor communication, in my opinion...but I'm used to it by now In all fairness, they are probably scrambling to keep up with orders, but still...
I don't know. I just follow the market and stocking up on coins while they are cheep and people happy to buy even in years to come
A couple years ago I bought a case (300) of kooks from Gainesville Coins in Florida. They ship internationally now, but I don't know their shipping rates. Their prices on generic 10oz silver bars is even better than APMEX or the Perth Mint's ugly cast bars. Just $1 over spot!! I just wish I could get USD without the 3% transaction loss. www.gainesvillecoins.com