I started posting a response last week to give you a link to a site with loads of Jim Sachs images, but cancelled the post when I found that the link is now dead.
I've got a few of those images, in IFF format (only 9 original format, 3 are crappy gif or jpg) if you like. When converting IFF, you should convert to PNG to keep colour accurate.
I started a thread about classic Amiga images on EAB last year and got no response. What I'd like to get are the images on the A500 and A1000 boxes, the Sculpt 3D "thing" (original full sized IFF image), and advertising images for DCTV, HAM-E, PageRender 3D. (and a few others that blew me away in the late 80's)