I saw the St Albert's sign on the way home from the grocery store. In general, I find out about sales from signs in the neighborhood, or neighborhood papers like the Longfellow Messenger and the Corcoran paper (can't remember the name.) There will be maps at the Midtown Farmer's Market on Saturday. I never use Craig's List for sales. Google various neighborhoods - most of them have websites, and have calendars on the website, not of individual sales, but group sales, and events like church rummage sales.

I used to just ride around the area on my bike on Saturdays during the summer.