Screws from sony cybershot dsc-p100 are missing

there is a company that sells parts for small consumer style digital cameras : Canon Repair NYC You can order the part and install it yourself or let them do it for you.

This can present a problem.
You must know what sizes the screws are. Some cameras have more than four kinds of screws on the case. If the screw is too long, then it can touch some component or the circuit board and could cause a short and ruin the camera.
Try to find someone with one like you have and get the kinds and sizes of the screws. I have Nikons, Canons, Panasonic, Sony and others and hardly any of the screws are the same in the different brands, or differ in kind such as wood type thread for plastic, fine thread, course thread and others. Plus, the sizes of the screw and the length will vary. The colors can vary as well as the type of head of the screw.
Another possibility is to get a broken camera from a site such as Ebay. Buy the camera, remove and use the screws you need, then resell the camera as a repair, as is repair camera.