They have invaded our company last week, giving away "free" bakery items if you sign up with Pricesmart membership. I ended up passing it as my wife have membership sharing with friend. One household can have two so we decide to pay the membership fee this year and friend pay next. So membership aren't that bad.
BUT...
It really sucks when you walk in to see some of the item for example Capri Sun cheaper or same price in La Serena or smaller grocery store like El Tescero in Santiago.
the same applies in POP; Jose Luis is a better deal for very many everyday things than is La Sirena.