Thomas Elder IV
Google
Prices are great!  Service is great.  The store is always clean.  Has a nice selection of hard to find items, like organic foods and chunks of soya meat.  You have a good selection of fruits, veggies, and dry goods.  I love that you can buy meat by weight so I'm not forced to buy a whole chicken.  Great fresh baked breads, sold by weight.
Their café inside has great food and service.  Mon-Fri they have S/15.00 plates for lunch.
I rarely shop anywhere else. It is worth the long walk every time!