I still have my old GBA which I occasionally pull out. I need to find my Pokemon Emerald game though. I have FireRed in it currently.

The biggest one would be CDs. I love collecting them. So much more fun having physical copies of the music. But a lot more work, as I rip two copies. One as MP3 and one as apple lossless to put on my phone. The files are 10x the size but uncompressed so it sounds amazing.