If you mean Mississauga, Ontario, Canada, there is nothing of any consequence. Greenhouses and nurseries carry poor quality fertilizers and bark mixes.
You may have more luck with hydroponics shops. Just do a Google search on 'hydroponics mississauga ontario'. I personally am not familiar with any of them, as I live in Toronto and there are plenty of local hydroponics stores. I do buy supplies from them, as well as from vendors at orchid society events and from Ray on this forum.
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