If you're using PX28 type batteries with an adapter as replacement batteries for your Yashica Electro, Radio Shack has a deal for you. They're changing the packaging on their 2CR-1/3N batteries from black and red to black and green and dumping batteries in the old packaging at half price. I got the four my local Radio Shack had for $1.98 each. I stuck one in my camera today with the adapter I bought off Ebay last year and it works fine.
Mike
Mike