The $300 St.Patrick strikes are being released on the 15th of march(see club website current news) so I would think there will still be some avalible on the 20th if 148 are minted.Since there is no tournament at that time not as many collectors are in town.I would guess it would take $300-$450 to win the 30 $10 strikes and exchange it for the $300 which has 6 troy oz of Silver.Good Luck.