Any really really good whitening strips?

And good non-expensive teeth whitening strips out there? I want my teeth to be nice and white by early Augest. Is it possible? Plz help me. I need a good brand. :'(
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Crest white strips aren't expensive and seem to be the best. I used them before and they work wonders. I tried Aquafresh ones and they didn't seem to do anything. Crest brand is about 25-35 I believe at WalMart. Good luck!
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