Mercado Libertad, a three or four story indoor market:
Info & photo:
I've been there twice & enjoyed it both times. ...not sure about antiques other than running across them...
What to buy:
TIANGUIS - if you love street fairs - check out the different tianguis held around town.
in Tonala on Thurs and Sun
in Sta. Tere on sun
Tianguis del sol - ?