Safeway usually has marked down their baked goods by 50% if you shop at about 8 or 9 p.m. or later, which is not uncommon for me, nor for my roommate or my ex - it's open until midnight. The busiest time at the Safeway in my old neighbourhood was probably 10 p.m. I'd usually into people (church friends too). That's also when lots of things have been marked down. The fresh soups are cheaper by then, also.
If your stores close earlier, I'd recommend shopping closer to whatever the closing time is to find good marked down items.
I used to go to Safeway late fairly regularly. The biggest difference I noticed is some produce would be covered with fabric and some of the lights would be off. No marking down.
I have seen a little metal trolley thing both at Superstore and Safeway that has things marked down, but it's always cookies covered in gross 'frosting', muffin flavours we would never buy, etc. The only thing I think we may have bought from them is seasonal items, I do like the cookies with the coloured sugar in the holiday shapes, good holiday memories. Not standards like bread, buns, tortillas. Sometimes I do see stickers on a few other treat things, but they are always with the regular stuff.
I don't like dealing with raw meat, so I'm not buying that on a regular basis. From the times I do though I have seen it discounted, but again, it isn't all together. It's right with the same cuts.
I've never seen clearance produce.
We shop at various stores. Superstore, Walmart, Costco, Safeway (not lately), Coop, Save-on, Sobeys, even a few things at Shoppers Drug Mart.