Compatible pumps ARE that rare these days... I've seen them being sold online for anywhere from $500 - $3,000 depending on their condition. I've purchased a few as backups because it's not a question of IF my current one will fail, it's WHEN.
They actually aren't leaving out the name of the project, it's called Loop - the system that she's on is not actually OpenAPS. I've tried both systems, OpenAPS lacks a clean, user friendly UI. As a result, most people (according to a recent survey) are running Loop instead of OpenAPS.