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Best thing I've found is a head torch. Far more versatile than anything hand held. For visual astronomy they are best with somewhat flat batteries. Energizer has had a red/white head torch out for ages (one like inertia8 describes, sold at major supermarkets) but it costs $30+. I also have a near identical Varta branded one that cost just $5 at an electrical clearance store. My spouse also has a waterproof one, different design, marketed for bush walking at night. I think she got it at Kathmandu outlet store during one of their annual clearance sales.
The one Bojan linked looks good too. Use half-flat AAAs in it, and it's probably going to be just right. Alkaline batteries will last you years.
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