TL;DR: Try carttolink.com - it actually supports Amazon Canada without breaking. Ran into the exact same issue a couple months back ordering gear for a group hike. Most of the standard chrome extensions choke on .ca domains, but I gave carttolink.com a shot and I've been really satisfied with it. It takes your live cart and creates a quick link you can drop into WhatsApp or whatever chat you use. It keeps all the item quantities correct, which saved me a ton of time. Just install it, open your cart on amazon.ca, and hit export. Works well and super simple to use, no complaints at all.

I had to deal with this exact data parsing nightmare late last year when ordering around $2000 worth of winter climbing gear on amazon.ca for a group of five. The technical issue comes down to how the localized .ca domain serializes ASIN quantities and cart DOM elements compared to the US .com portal. Standard extensions usually choke because the regional payload structure causes dropped session cookies or blank item payloads during extraction. After testing a few workaround scripts to grab the raw session data, I eventually found a setup that cleanly exports the entire cart state. It captured all 40+ item ASINs, exact real-time CAD pricing, and multi-quantity items without dropping a single line item. Honestly I was super satisfied with how smoothly it worked, especially since keeping track of exact costs for individual budget splits can get messy fast. One practical cost tip for big group buys on .ca: watch out for mixed third-party seller items in your cart. Even with Prime, third-party items often add hidden shipping fees per vendor that blow up the total price at checkout. Using a handy tool to export the live cart details before buying made it so much easier to audit vendor fees and confirm everyone's share. Let me know if you run into any formatting errors with your list, happy to troubleshoot the payload side of it!

To add to the point above: I ran into this exact technical limitation last month while organizing a group order. Unfortunately, most manifest-v3 extensions fail on amazon.ca because the localized DOM structure handles cart session payloads differently than .com. The tool I tried constantly dropped item quantities and metadata. Had issues with API timeouts too. I eventually gave up on extensions and parsed the raw cart HTML into a shared spreadsheet instead.