Some suppliers have their products and prices available on their website, but most of the time you will need to get in contact with them first for their list of products/prices. Contacting suppliers and product research go hand in hand. If you want to do one, you will need to do the other as well. So, if you are ready to start researching products, then you will want to start by getting in touch with a supplier and checking out their products and prices.
Do I need a supplier's spreadsheet to see their inventory?