Does anyone know where to get gamma seal lids in Canada (Ontario GTA) in store?

Looking to store flour, rice, etc., that will be used within the year-ish in 5-gallon buckets (food-grade) with dessicant packets. The snap-on lids have been a pain to use.

I use mylar bags with O2 absorbers for longer-term storage. If you have any alternative suggestions for storing these items for year-round use, I'm all ears! Thanks.