Nexus 4, released in Oct 2012, is still better spec-wise in terms of screen and RAM than most $50 devices.

I picked up one on ebay for $AU80 and the battery is still okay but the non-replaceable feature the only thing keeping me from using it indefinitely. Although the supported OS is Google abandonware, so this vulnerability may finally encourage me to upgrade to a custom ROM.

(And yes I'm currently a thrifty student and happy to accept hand-me-downs rather than spend $500 on new bling)