Examine the markings on the battery. It is likely to be a 1.5-volt Silver Oxide or Alkaline battery. It doesn't matter which one you use, although the Silver Oxide battery can handle heavier energy-consuming loads, such as a multifunctional chronograph. It can be purchased from amazon, here: watch battery 1 5V silver oxide 357 SR44 SR44SW 10 pack. I hope this was helpful. Cheers
Brand new men's cost around $1200 - $1500, ladies - $1000 - $1400, depending on materials used. Hard to say about used ones, as it depends on the wear and tear, overall look and performance.
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