You can t scan a hardcopy photo and use it.Most companies provide online stores with approved product pictures for online stores. Contact your vendors/distributors and ask them for the pictures.
You have to read the licensing agreements.Legally you cannot use a photo you find on the web with out the photographer s permission. My favorite stock photo website is http://www.photo-wizard.net Here is where you can find some other inexpensive stock photo directories: http://www.small-business-software.net/s��Another site list can be found here: http://www.webmaster-elements.com/webmas��Goodluck