I don't think it's quite that bad : 30 pages of 48 each, plus 8 on the last page : 1448 items.
Unless... there are others somewhere I didn't think to look?
Still a massive effort to form up and print, though.
Anyway, Tebee, I think you probably only need one big image for each type of thing - i.e. not one for everything in every scale.
But you should state the scale of the item in each picture. You could then rotate through each scale used for the image in each group.
That cuts down the work somewhat. Perhaps... a few hundred? (It depends how close you are to everything in every scale as well as how many distinct scales you have.)
BUT. I also think the picture should be higher resolution than the small shop index display images. I'm not sure low-res images would gain you anything.
For items you've already photographed, I'd use that image almost every time - hopefully you still have the original in a higher res. Then backfill with images of all the other things, 625x465 resolution gleaned from the item pages if necessary.
I guess you might be able to (or get someone to) write and use a script to scrape the web-pages and extract an image for each item in your shop. Because it would be a big job otherwise.