I have a woocommerce store and I have a folder full of images (3GB of images), I will send this.
We have just imported 1000 products without images into 1 category on our store. We have a folder of images that are named by the SKU so you can match the image to the product. I have a bulk editor plugin on the site so you don't have to go into each product, instead work down a spreadsheet online.
I also have an import/export plugin so you could alternatively export and import with the product images added to the import spreadsheet and then upload images via FTP. Completely upto you how you do it.
Budget is £50.