Hi spencer,
You may have seen this already but the better options or possibilities I’m aware of in and around the Charlottetown area (subject to making sure that any mattress you are considering meets the quality/value guidelines I linked in my last reply) are listed in post #5 here.
If you are also open to an online purchase then some of the better online options I’m aware of that ship accross Canada are listed in post #21 here.
Phoenix