What are you saying the comment parent should have bought? TextSecure is free-libre-open-source software, it isn't sold anywhere. It depends on the Google Play Services, and cannot be run effectively if the framework is not installed on the device.
> There is a version for SMS pre-installed, but I'm not a fan of paying money for 128 bytes of data.
I think I misread this as saying there was a paid-for version available for install, but I have no idea how I got that, since it's clear that it's the SMS charge he doesn't want to pay for.