Get a citizen eco-drive you like from the officialwatchdeals store on ebay or from somwhere else but there you find them at very good prices.
Look for coupons on the product page too, often they have extra 20%-30% off coupons.
Just don't hide it in a drawer in the dark when not wearing it, leave it on a shelf in a well lit room where it can get some daily light and it will just keep going.