From around 1983 through 1988, Marvel and DC re-priced some of their comic books for the Canadian market.
Most Marvel comics published during this period either had US cents prices only, or US, Canadian and UK prices all together on the front, something like this:
US price box on Amazing Spider-Man 252 with regular price of 60c
Regular Marvel price box with three different prices for different marketsThe prices on the covers of Canadian price variants are always higher than the standard price on the cover of US issues.
Canadian price box on Amazing Spider-Man 252 with new price of 75cYou can also tell Canadian issues, because they always have a bar code (UPC) at bottom left of the front cover rather than Spidey's head.
Direct edition of Amazing Spider-Man 252 with Spidey's head at bottom left
Canadian price variant of Amazing Spider-Man 252 with UPC bar code at bottom left
US newsstand variant of Amazing Spider-Man 252 with UPC bar code at bottom left AND US priceThere are plenty of US editions which have bar code UPCs at bottom left as well. These are also a much-collected niche (known in the hobby as newsstand variants).
Canadian price variants of DC Comics have different (higher) prices than their US edition versions of the exact same issue #s. The word CANADIAN is also printed below the price, sometimes. (But not always!)
Here is Batman #357 to illustrate this.
Batman #357 regular US price box
Batman #357 regular Canadian price variant boxThere are hundreds of Canadian price variants, but keys are the way to go.
Here are some ideas for you to look out for.
Marvel Super Heroes Secret Wars 8 Canadian price variant
Thor 337 Canadian price variant
Batman 357 Canadian price variant
Archie's Girls Betty and Veronica 320 Canadian price variant
Swamp Thing 37 Canadian price variant
Amazing Spider-Man 238 Canadian price variantHave this book? Click to appraise its value NOW!
Most valuable comic books of the Copper Age (1980s)
Full Canadian Price Variants Comic Book Price Guide