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The New Yorker (Magazine)
The New York Times (Newspaper)
The Economist (Magazine)

What else?

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I've heard Popular Science is good too. Remember to always buy these in print.

The Atlantic.

But also check out scholastic publications on JSTOR or some other database.

I know this is an old post but if anyone's reading: Harper's Magazine is great as well

Total necro but I second the suggestion of scholastic/academic work you can find on places like JSTOR, as this is the genre actual RC passages are usually taken from. I didn't find news/culture magazines to be that similar content-wise or density level.

Scientific American has good scientific passages, even better than Popular Science.

Some people will see a pattern of "struggle" depending on the subject of RC passages. You should focus your extracurricular reading into the areas that you do the worst on.

I'll throw out a ref for longform. It's an aggregator of longform articles. The articles sometimes aren't up to lsat quality but I find that reading long things helps with retaining info for rc

Throwing out the Smithsonian as a good magazine for hard science/social science passages and Philosophy Now (can be purchased at most Barnes and Noble) for more academic focused philosophy.