Gold from the mint, must be proofs or some sort of set. Good luck.
Regarding the coin shop, yes, they are a bit of a problem. My main supplier has been rationing the gold sales of late, even charging higher prices because demand is high. When he does buy gold, it is hardship cases, which are happening in this economy. But he has a very high turnover on gold. Today after reminding him how much I buy I got this:

These are the largest reasonably common bullion coin you can buy.
If you want gold, try APMEX.com, they have stuff in stock, and have decent sell prices.