All Electronics has a super price on a super capacitor. These 4.7F (yup, farad) 2.5V capacitors from Elna (#CBC-18) sell for $3.85 each. Even better for handling all of your serial and parallel capacitor circuit design needs, bulk quantities of these capacitors are available at prices down to three bucks apiece. Remember you can build a 2.35F 5V super-duper capacitor by joining two of these capacitors in series. Then link two of these super-duper capacitor duets together in parallel for a mega-death 4.7F 5V capacitor power pack. Whoa!