Keep your eyes peeled at Benito Juarez Market — you're likely to come across some treasure or trinket among the stalls here. After you've had a thorough browse of things, grab a bite to eat from one of the food vendors.
You can keep your money safely stashed away, because it won't cost a penny to explore Benito Juarez Market. Located in Centro, you'll find some cool attractions not far from this community marketplace. Why not explore Zocalo Square, Oaxaca Cathedral and Monte Alban too?