For just a little bit more, I would go with a 4sevens Preon 2. If you want to keep it under 40 some of the Preon 1's can be had for less than 40 (prices according to color)
Whatever you choose, I suggest you make sure it takes standard batteries. That way you have rechargeables as an option, but more importantly, if you buy over the counter disposable, they aren't super expensive.
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