New York Mint grossly overcharged me for a 5 oz koala silver coin from perth mint Internet

I was called numerous times to get me to buy a 2011 ms-69 5 oz silver koala coin.  It was a first time coinage from a reputable mint and was told they were in high demand and low mintage.  My research did not even find the coin as it was brand new.  I was charged a very good rate of 798 USD instead of their ususal 999 USD as I was a "good customer" (fool) so they said.  I have noticed the coins sold a few months later for hundreds less  and now sell for 300-400 USD.  I had done a little business with them before and thought their prices were a bit high, but this coin was gouged beyond belief.  I know I should have known better, but they were convincing.  I told them when they called me with a deal again, that I would never do business with them again.  WHAT A RIP-OFF!  Coin shoppers beware.