Typically if a supplier just has their products online on a website, you may to pass on that supplier, as they aren't very efficient to work with. You would have to go through each product one by one and see if they look good, which would take a lot of time. It is also difficult to build a relationship with a sales rep.
One option is you could hire a VA to turn all of the products into a spreadsheet of UPC and Price. So, they could find the UPC or ASIN for each product, along with the price, and add it to a spreadsheet and create an inventory list. You can then take that spreadsheet and upload it to an Analyzer Tool to narrow down which ones are good to work with or which ones are profitable. This can help to take the work off your hands.
Another option is to use the Webscraper Tool when has the ability to go into a supplier website, extract product data and essentially build you a spreadsheet that suppliers would normally send you. This tool is completely free and below is a link to their website to learn more about it.
My supplier only send product in emails.
Can I make my own price sheet if a supplier doesn't supply one?