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These frequently go on sale for 30-40% off, but rarely for 50%.
Note that only Sensodyne toothpastes with "Repair" in the product name have Novamin, which is the main active ingredient most people with sensitive teeth are after when they shop for Sensodyne toothpastes.
Sensodyne toothpastes without "Repair" in the name are usually all rounders with potassium nitrate added in, which is the most common active ingredient found in sensitive toothpastes.
Here's the whitening version if you like that sort of thing.
The non whitening version is generally recommended for most because most whitening toothpastes simply use a higher abrasion formula to more easily strip off the top most layer of teeth so the unstained lower layers come out more.
If you have sensitive teeth (which you probably do if you're after this toothpaste), this may cancel out any benefits to sensitivity or even worsen it.
If you don't have sensitive teeth or don't know what Novamin is, then go buy a cheaper fluoride toothpaste.
These are terribly expensive, even when on sale.
For any potential hoarders: The most common rule of thumb recommended by most dentists is 80% fluoride potency at the 2 year mark, so don't go completely crazy with the stockpiling.
Take a look at the price graphs on Google Shopping for an idea of how often sales occur.
Thanks for the information. I wasn't aware that all the differing Sensodynes didn't have the main essential ingredient of Novamin.