how to get many image urls at once

I am almost ready to upload my inventory to my new squarespace website.  I currently have about 40,000 items to upload.  There are two images per item.  I would like to upload all of the images to my assets folder to make them available for the item.  

How do I get the URLs once they are uploaded.  I currently use Inkfrog, however, that is not option to link to as I plan to get rid of Inkfrog once this is complete.  With Inkfrog I am able to copy 50 image URLs at a time, which is a very slow process for so many images.  But, it is better than doing one at a time.

If someone knows of a way to get many at one time it would be a great help!!  Thank you!