Tep Wireless:

http://www.tepwireless.com/tep-me/te..._countries.php

Rebelfone:

http://www.rebelfone.com/World-Data-Cards.aspx

You will do better with your own unlocked device and a prepaid SIM. Rather than spending less money, I would suggest you spend a little bit more. Rent a mobile hotspot device (such as a MiFi). That way you can use the data connect with your mobile phone as well (via wifi).