Look at the HP
H470. Somewhat larger than the Pentax, but it has Bluetooth connectivity (we can print from our Blackberrys), a great battery, and prints in color. We have an old flight bag that carries a Lenovo laptop, the HP printer, a small-footprint scanner, a floppy drive (for the GD FMC database updates) and random cables and stuff. I like that we can pull the HP out of the bag, hit the power button and start printing in about 20 seconds. You can find the ink cartridges pretty much anywhere in the states, though they are scarce in Europe.