Candles that use a wick and wax will go out when one or the other is consumed or the wax overflows the wick (common in wide bodied candles). Any electric candle will burn until its battery loses charge or its lamp burns out. If you mean a candle whose wick reignited when you blow it out try a gift card shop, aisle three, but you'll have better luck finding them on the internet if you describe them as "reigniting" "candles you can't blow out".
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