Your office is Scarborough, I'm assuming? Maybe they do things old-school because I was under the impression that MTL also asked for scans.
WIth 96 dpi it's....possible, but your pictures are going to look kinda
cronchy. I'd say 72 - 96 dpi is possible, and if you convert to something like PNG and then run
tinyPNG, it might be possible.
Also might want to arrange two in a page and use my favorite tool,
Free PDF Compressor to achieve results. A few options, but you'll need to do some fiddling around