Can anyone tell me where i can buy a spre parts for a digital camera?

Try Ebay/ Lots of people sell non-working digital cameras for parts.

I hope you are using a Digital SLR camera, and are looking for add-ons like filters and lenses, and not internal components.

If that's the case, then you should look online at the several camera-related websites - they have plenty of accessories for sale.

If you are looking for inernal components (motors, drives, chips) - please contact an authorised dealer only. Getting one off ebay or on the net may be cheaper - but it may damage the proper functioning of your camera - resulting in anything from a blurred image to a dead sensor.

If you have a simple point-and-shoot or the low- and mid-range cameras like the Sony Cybershots and the Canon Powershots, then, i'm sorry to note, there're no spares of any kind available for such cameras.
The exceptions are higher end P&S cameras like the Canon S2-IS and the Sony H1, which look like SLRs, but infact are advanced point-and-shoot models.