I bought ASUS ROG Strix B550-F Gaming (Wi-Fi) AMD B550 from Staples Canada (Free shipping). They sell it at 264.99. I was able to get it price matched with Amazon.ca's price of $254.99 (it's 259.99 now on Amazon Canada).
They don't adjust the price of my bill, I was told that I will receive refund of $10.50 within 10 days to my payment method. Additionally staples just started "spend $50, receive a $10 coupon promo". I purchased mb day before this promo launch date. I asked customer support if I could get this $10 coupon, rep said as one time courtesy he will just refund $10 difference. they are really cool about price match and stuffs like this. all done through chat agent.
Plus, Drop app is offering 15000 (worth $15) points for purchase over $50 (I can buy amazon canada gift card with this points) . and also waiting for 1% cashback from rakuten canada.
total price: $278.24(264.99 + GST) - $10.50(price match) - $10 (staples being super nice) - $15 (drop app 15,000 points) - $2.7824 (1% rakuten Canada) - $1.3912 ( 0.5% TD card cashback) = $238.56
Wise people of r/bapcsalescanada please teach me how I can improve my shopping skill. I still need to buy Ram and CPU, and maybe PSU.