Yeah, Quebec dépanneurs/gas stations/grocery stores can sell wine in addition to beer, but only if it's locally bottled. Which means it's either Quebec wine (which ranges from bad to actually quite good) or wine that is imported by the SAQ in tankers and then bottled in Quebec. That stuff is generally plonk but sometimes okay as basic table wine.
No spirits allowed. There was talk a few years ago about allowing local distilleries to sell their products outside the SAQ but nothing has come of it.
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