I've got an Olympus D-510 digital camera on order. I wish to also purchase a 64MB SmartMedia memory card and NiMH AA rechargeable batteries and charger. I noticed that prices on those accessories range all over the place: from about $30.00 on the SmartMedia card to $179.00, and from $9.00 to close to $100.00 on the batteries and charger. Why? Can anyone tell me what to look for (or look out for)?