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LED tapered candles?

Is there any way to make a battery operated flickering LED candle? I've seen them for sale on the net but they cost like $12 a piece? I was thinking 1/2 inch x 9 inch PVC, CPVC or copper tubing with 3 AA's and an LED from a cheap tea light. How do I make it flicker tho? I would like to use these in a candelabra in our church. they don't allow live flame.