Thermal bluetooth printer
cost around 4500
charge it
portable
no need to connect through wires
use bluetooth
connect with android table/phone for even more small compact functionality
search in quickr, buy in SP road, Bangalore
you need to buy thermal roll paper for printing
link: http://bangalore.quikr.com/Thermal-POS-printer-IBM-4610-for-sale-W0QQAdIdZ226313252
but this link from quickr, may not be there forever