I meant to post this photo when I took it (on 3 May), so I hope you don't mind a slightly older photo. I just liked this one for some reason - perhaps it's the angle, perhaps the slightly-out-of-focus scooters in the background.
Seeing the sign reminded me of the only yard sale (often known as garage sales here) that I visited many years ago out of curiosity. Clearly the event left me rather pessimistic about the chances of actually finding anything of interest at these sales. The items I browsed that day were really nothing more than junk for which I wouldn't really have ever had any use.
I do think, however, that I should give it another try. I imagine one could find some really interesting things hidden among people's white elephants. Perhaps, if you're a tourist, it would be an interesting thing to do too... visiting a yard sale. You may find something interestingly different to buy, and you may meet some interestingly different people too. For your own sake, though, be a little cautious; this is a city, after all, and we have our fair share of unsavoury people too.
Oh, and remember that a yard sale is often called a garage sale - so don't go to a garage sale expecting to come home with a new garage. ;)