Product Listings / API to get catalogs for electronics

We are trying to figure out an easy way to get product listings / models numbers / images for a gadget site that we are launching.

Are there any services (paid or unpaid) to get the latest information on electronics?

For example - All canon cameras or all mp3 players by samsung.

Any help will be greatly appreciated. We don’t want to reinvent the wheel by going to each vendor to get their catalog.