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The Oral-B iO Series 2 Electric Toothbrush is now just $31 at eBay. You'd pay between $40 and $50 for the same one today at Amazon. The toothbrush includes a charger base and brush head, features an oscillating motion with a built-in timer, and connects to an app. Buy Now at eBay

Battery-powered toothbrushes that cost less than a standard manual brush are rare, and this two-pack puts the per-brush price low enough that it's worth considering as an everyday replacement for a regular toothbrush. The micro-vibrating bristles give you more cleaning action than a manual brush without committing to a rechargeable electric model. Buy Now at Target