I think some on here have pulled apart their MacBooks and installed different matte panels.
This is major surgery and voids your warranty but I'm pretty sure there are people on here who were crazy - and talented - enough to do it. If I tried I would probably wind up with two broken LCD panels (old and new), a disassembled MacBook that wouldn't go back together again (if I could even disassemble it, which is questionable), etc. I can use computers but fixing them, that's someone else's job
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I do not like the glossy screen but ultimately it is not enough to make me jump to the bigger, heavier, less durable and more expensive MacBook Pro, which is why I am about to buy a white MacBook.