3 volt Lithium On Sale .69 ea.
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I have found Botac Tactical to be a good source for tactical equipment and have bought from them for years! Especially when they have sales or monthly specials.
Right now they have a sale on 3 volt Lithium CR-123 Batteries!
50/pk for $34.50 = 69 cents per battery!
I buy all my batteries from them and wait for the sales.
These are Ultralast but at any given time they also stock Surefire, Duracell, Energizer and Rayovac Sometimes they sell in 20 paks too.
Sure beats $10 for a 2/pk at Walmart!