Boatland is by far the best deal, but it is not salt ice, maybe buy more? Easiest to load and about 1/2 price of Salt Ice. Make the odd ocktail with it too until the guts and slime get on it.
CR Seafoods has best salt ice but has a short season, not sure they open until maybe July.
High Tide may have some but not that accessible.
Car Wash near River Sportsman, I found it to be a ripoff either eating coins or spitting out a little bit of slush