Until now, the best that I found is AT&T Pay As You Go plans - need to purchase a cheap device (didn't found option just to purchase sim card) for about 25$, monthly plan will cost another 25$ and Data plan for 25$ (1GB, and I'm sure I'll need a much more :). What make the story quite expensive. 

Any others option that the local guys can recommend? 

Thanks,

Itzik