This Digipower Vivitar ac power adapter compatible with the Vivitar 8000. If you plan to sell on Ebay at all you already know that you need a digital camera.
Digital cameras eat batteries, even rechargeables.
So to be certain that you have power when you want it an adapter is a must. I like this one better for several reasons. As a physicist I can tell you that there are 4 important features in an AC adapter. Well I guarantee that it's not rated for as many amperes that your camera will pull. Your camera likes a nice steady flow of current, give it to many spikes and you don't have a camera any more.