Very good teeth whitening products that aren't to pricey and can be bought in stores!?

so im looking for teeth whitening kits, strips or pastes that ACTUALLY WORK GOOD aren't to pricey and can be bought in stores. id really appreciate if you could list items that you've personally used and has worked or that a friend or someone you know has used!! thanks for any help! (:
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My brother and I had a contest.. I used crest white strips and he used baking soda. It had the exact same result. I'm not sure how he applied it so you'd have to google it but baking soda is cheap and not harmful
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