Seems like there's a Canada page but no merchants... and I actually have no idea where they sell bike parts here but it would be appreciated if someday Canada could be completed :)
cheezmeister, I'll need to run this one passed our account managers. My suspicion is that the drop down menu listing the potential country pages is a legacy item from our PCPartPicker site. We do plan to keep expanding into other areas (Chain Reaction, Merlin, and other UK retailers), but we may need to limit the options to those countries with their current retailers. Thanks for pointing this out.
Chain Reaction and Jenson USA both ship to Canada and are sometimes a better option than our local retailers. Maybe they could be added to the list and a warning could be added to the validator that they are out of country and might add extra fees for shipping / customs.
We do list Amazon Canada, but that's the only one so far. Generally we don't cross-list retailers across different countries because we can't get an accurate price on it - the retailers don't provide their feeds in alternate currencies or factor in import taxes (if applicable). The closest we've come to doing something like that is within the EU, but that hasn't been implemented yet.
Unfortunately for right now due to the COVID-19 situation, we're not linking to retailers that also ship essential goods. That's a temporary thing until things settle down. It's mostly on the PCPartPicker side, but we're applying it here to CyclingBuilder as well. It's just a small thing we can do to help reduce the logistical burden of non-essential goods. Because of that we're not factoring in prices from those retailers (which includes Amazon CA) on part lists or product category lists.