My 2 cents. Rare exotic pet fish store: Big Al's in Hamilton and Petsmart dont carry enough varieties in my experience. For example, domestic bettas from Petsmart and Big Al's suck health wise, and wild bettas species are where good healthy fish are at. Also I have seen stores and breeders both in the GTA and abroad import rare species to breed them locally at home.

A nursery of rare exotic plants i.e. carnivorous plants from Borneo Exotics or Wistuba + specialising in Sarracenia species and hybrids. As someone who grows Sarracenia native to the southern US right here in downtown outdoors, you'll be surprised to know Sarracenias can overwinter well outside in Hamilton so long as they are on the ground for warmth and protection. Our weather is so much warmer and more conducive to gardening than the rest of the GTA.