Swin Trunks or Board Shorts

Okay, trying to find swim trunks up here in this frozen wasteland we call canada is like trying to find a grain of salt on the beach.
Is there a good place in PV to buy swim trunks or board shorts?

Tons of choices - from the big grocery stores, touristy stores (Sr Frogs etc.) Mexican dept stores - Woolworths , Walmart etc. Might be a bit of a problem if you need a larger size but probably not. Same advice and choice for water shoes .

Thanks Smitty. I have enough to make do for a day or two but would like another pair. I take it the water shoes are for in the ocean?