I use paint to chop up the maps into nice sized pieces that I can print myself on either 11x17 or 8.5x11 pages, and laminate those (I have a small laminator at home).
To size the image, I simply select either 10x16 squares or 8x10 squares - this makes the squares 1 inch sized when printed. A bit of tape hold the maps together on the table.
One additional trick that I use is that I "fix" the images with copy and paste to hide the secret doors and rooms. I print a copy with the rooms and doors in place, cut out the small area needed for the door or room and laminate those small areas too. This way when the PCs find a secret door/room, I drop the small laminated piece on the map (bit of tape to hold in place) and the adventure continues.
Before I laminate the maps, I write on the back of the maps the name and number of the scenario, along with the pertinent room info.
I have a fair number of scenarios mapped out this way, and the local PFS GMs are using the maps on game days - makes life easier for everyone.