I love Jumbo, there's none near me though, and I don't like online grocery shopping because I want to make my own substitutions, so when we finally take delivery of our 0KM I'm going to be shopping there more often. Like you said, it's the cleanest/widest selection in terms of big chains here, and while it's more expensive, I prefer the experience, they just need to open one up downtown.Carrefour is the hyper-supermarket based out of France. Jumbo chain is from Chile. I find they have expanded variety of international products, plus one of the better and cleanest supermarkets in Argentina. Not the cheapest though. Owned by Cencosud which is multinational, though primarily SA and headquartered in Santiago.
For all dried sausage and pancetta I like to ask the butcher if they make their own. There are a few small carniceria around who do this, though often can’t provide all year when the hot season disrupts small scale artisanal technique.
Also the plus of the one I mentioned is it has an Easy there too which lets you get a lot of stuff taken care of in one stop if you have a car.