You can buy and store with the government-guaranteed Perth Mint in an allocated depository account (PMDS).
More in a sec.
The Perth Mint also does unallocated and certificated accounts but I wouldn't go near these. Ted Butler is generally antsy about the Perth Mint because of the unallocated option, but I'm more relaxed. The Perth Mint isn't Kitco; it's a working mint.
In PMDS (Perth Mint Depository Service) the storage is 1.9% p.a.
That's pretty expensive. The government guarantee is a good and a bad thing. I know a lot of people won't go near it for that reason. It's not hard to envisage a benign confiscation.
1000 ounce bars are numbered. I guess that offers more security than 100 ounce bars.
The best that can be said for the PM is that it offers geographical diversification. And if you aren't worried about confiscation then you have the knowledge that it's a highly kosher, officially protected institution.
The charge for producing the silver in an allocated account ounce you decide you want to have it delivered really bothers me. This is something that should bother everyone that has an allocated account with the Perth Mint. Still I wouldn't disparage anyone who chooses to do so.