What's the best one-time at home teeth whitening product?

i don't want to do the nightly strips, i want a 1-time deal... and prices if you have them too please! thanks y'all!
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Lucy, disagree all you want but not all of us are lucky enough to have enamel that keeps our teeth white even if we take care of them. I've used Rembrant's 2 hour whitening kit and it worked pretty good but the results didn't last too long. However, I used the two week Aquafresh kit (with the trays that you only have to wear for 15-30 mins a day) and got great results for awhile.
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