Size 12 Narrow width women's comfort shoes in Canada
You can get great deals on large size shoes at Amazon with a bit of patience. Their own Amazon Essentials range up to size 15 US is well worth a look with fashionable styles at great prices. The women's shoes department goes right up to 16 US, although many of the largest sizes will either be Chinese brands or unisex.
Famous British shoe brand with selected shoes, boots and sandals going up to size 12 US. Free shipping & returns for Canada. Many styles also come in wide fit, with a few narrow and extra wide styles available too. Clarks are the brand I've been able to rely on most over the years for comfortable everyday shoes particularly their cloudsteppers and unstructured ranges. Clarks also have Canadian stores and are widely stocked across Canada, although these may not have larger sizes in stock.
Comfortable timeless heels & flats, including wedding shoes, in 4 widths up to size 12 us (45 eu). Widths differ in the toe box only as follows: A for narrow, B for standard, C for roomy toe box or small bunions & D for a very wide toe box or larger bunions. Ally go to great lengths to ensure the right fit. Take the fit quiz, request a fit kit or book a 15 min virtual fit session. In the US, you can even try sample heels at home for free before you order. They also offer a made to order service which still has 14 day returns. Free US shipping & returns for most orders. Ships internationally including Canada, UK, Australia, New Zealand, UAE & the Far East with all taxes included at checkout (other countries may be possible on request).
Specialist large size shoe store in Quebec also selling online to Canada ($10 flat rate shipping) with a wide range of women's shoes in sizes 10 to 15 US, with selected fantasy styles up to size 17 US. Large selection of brands and styles. They even do rain boots, slippers and socks. They are happy to advise on the right size for each style if you send them your foot measurements before ordering or during checkout. You can also visit their shop in Rue St-Hubert, Montreal. Website is in french.
Canadian family owned store shipping to US & Canada with select shoes, walking sandals & boots available up to size 13 us including some narrow, wide & extra wide fit. Mainly comfort and traditional styles. Several stores across Ontario. Note that you cannot return online orders to stores & must pay return shipping costs.