Hi. I've got a vivitar vivicam 4000 camera. But

The absolute largest capacity SD card which your camera can use is 512MB. Your camera is only a 6MP model, so that size will still hold plenty of images even at the highest recording quality settings (approx 183 images at 6MP Fine quality setting, 311 at 6MP Normal quality and if you dial it down to 4MP you're looking at 305 and 498 respectively. 4MP will still produce perfectly good image quality for prints up to A4 size).

You can no longer easily find SD cards of that low a capacity in most shops, but they are widely available online. As you can't wait that long, I suggest that you join your local FreeCycle group and post a request for one (your first posting must be an offer, but it can be for anything at all, and once posted you can immediately post a request). Plenty of people have obsolete cameras lying around and even stacks of old low capacity memory cards which they are often happy to give away.

You can also download a free .pdf format user manual by clicking here, courtesy of Retrevo.

I hope that my speedy, free, and comprehensive reply has been of use to you, and that you can take a moment to rate my answer.