To print, I suspect you'll need one of the kiosks. They charge by the minute of usage and by the printed page, so the cost to print them out might exceed the value of the coupons.
When I've needed to use a kiosk, it seems to me that it's around 20 cents per minute for internet access and 50 cents per printed page. And I don't think you can hook up your computer to their printers - otherwise I'd say use the wifi (yes the MSS lobby does have it) to retrieve the coupons and maybe even save them as PDFs to your computer, then just pay for the printer.
I have used and/or seen the kiosks at the El Cortez, the 4Q, MSS, and the Las Vegas Club.