The whole iPhone I got was $100 itself, second hand, some older version that was still useful for development. Its purpose was to let me port my game engine to iOS. I managed to port a single app, run it on the phone and then decided to forget about iOS at all. The necessary effort to deal with all that stuff is crazy and it's better to spend all that time elsewhere.

Today that phone stays in the drawer and I can't run that app on it anymore; I'd probably have to spend hours figuring things out again just to redeploy it so I can launch it on my phone.

Meanwhile, on my actual phone, I can just scp a deb package and install it with dpkg, and it works until I uninstall it myself.