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I use rechargeable batts and have no idea how much they cost me.
A tenner for two according to this..
http://www.amazon.co.uk/Exposure-RCR123A-Li-Ion-Rechargeable-Batteries/dp/B00AAV3OCK%3FSubscriptionId%3DAKIAILSHYYTFIVPWUY6Q%26tag%3Dduc08-21%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB00AAV3OCKI do use non-rechargeable for racing because they last a full race. Last one I bought was in the USA though so again no idea how much it was. 3-5 bucks maybe?
But they are a fortune in batteries right? Hence I got another Smart Lunar.