In regards to the mats just remember that they cannot be left in extream heat or they will warp. You will never get them flat again. I'm thinking about your travels and how hot the entire US is these days. I agree the Olfa is the best. I have one over 20 years old. I store it flat and every now and again run a nylon bath scrubbie over it to get any caught threads or batting out of it.
One thing to consider about rulers. I've been told to stick with the same brand name for the most accurate cuts. Many of the Wal-marts have discontinued their crafts & fabrics dept so have friend or family check to see if they still carry the items.
Safe travels and good luck with you search for new tools.