Here in the U.S., nearly every dollar store sells containers filled with silica gel beads, for the purpose of placing the container into small enclosed areas, such as closets, lockers, etc. A lot of silica gel for relatively little money.
Perhaps Canadian dollar stores have something similar?
Silica gel is pretty common in packing material. I work in tech support and I got a bunch when we deployed 21 computers in our Mac lab a few years back. Apple packs their Imacs with silica gel. The great thing is you can dry them out to recharge them.
I bought the 2-pack in 2009 and recharge (plug into 110v) them overnight every 3 wks, then put one in each of my two large camera cases with monorail view cameras. They're still doing the job.