looking from their source code
, seems like they only ship to the following ZIPs: 78660, 78613, 78653, 78664, 78681, 78701, 78702, 78703, 78704, 78705, 78708, 78709, 78711, 78712, 78713, 78714, 78715, 78717, 78720, 78721, 78722, 78723, 78724, 78725, 78726, 78727, 78728, 78729, 78730, 78731, 78735, 78741, 78742, 78745, 78746, 78749, 78750, 78751, 78752, 78753, 78754, 78755, 78756, 78757, 78758, 78759
What's with Autstin for startups? car2go also started only there...