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Nowadays this type of film pretty much disappeared. Though cheap, application is very annoying and it scratches if an air molecule goes near it.
The modern equivalent is those laser machines that are all over shopping malls and phone repair shops. They use a new polymer sheet and the laser cuts it to the correct shape. These are also cheap, feel a bit better, and have an interesting property of slowly healing light scratches and molding to the screen so they can "kick out" bubbles.
Not nearly as cheap as the sheets you are mentioning, though. They're probably still sold in places like AliExpress if you look around.