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Are you looking for something that lasts or do you prefer the typical supermarket ones? I usually grab Ravensburger from Amazon or toy stores like Toys "R" Us if there are still any in your area, because honestly they're the ones that lose the fewest pieces and have the most resistant boxes. There's also Educa, which are pretty good and you can find them in board game shops. If you want something cheaper, Carrefour and El Corte Inglés have decent house brands, though sometimes they come with defective pieces, but yeah, that's what you get.
How much are you actually willing to spend? Because if you want something that won't fall apart in two weeks, it's worth the investment: Ravensburger and Eurographics are insanely good quality, but there are mid-range brands like Clementoni or even some Lidl ones that are pretty surprising. What I'd do is look directly at board game specialty shops (like Gameflow or similar ones in your city) because you can also touch the box there and see if the pieces fit together well, and that's really what makes the difference between a puzzle you enjoy and one that drives you crazy.
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