The Mega is a very large supermarket and is very competitive to Walmart.  Lots of locals shop there and is better than Walmart.  Everything you will need during your stay in Nuevo Vallarta Riviera Nayarit.  You can shop for food, clothing, liquor, beach suppies and even has a pharmacy.  If you are in PV it is probably better to shop at Walmart since it is in PV.  If you are in Nuevo Vallarta Flamingos or Bucerias area though you need to go to the Mega.

 There is now a Walmart in Nuevo Vallarta.  It was built in the last two years.