Do some looking around at other places. I know you are in Canada and shipping may be high, but check on Ebay and online supply stores - you may be able to find a smaller size of tablets.
Here's a smaller size, for $20.39 but I see it's backordered for a few weeks, but you may be able to find that size elsewhere
https://www.qcsupply.com/virkon-s-disinfectant-tablets.html
Here's a smaller size, for $20.39 but I see it's backordered for a few weeks, but you may be able to find that size elsewhere
https://www.qcsupply.com/virkon-s-disinfectant-tablets.html