Found this gem at the flea market. Sansa E200 series. Excellent condition, came with all the accessories. Paid $15. Works with a 128gb formatted as FAT32. : r/rockbox
SanDisk Sansa Clip Zip 4GB Rockbox SDMX22 FM MP3 Player Installed Dual Boot | eBay
SansaFuze < Main < Wiki
Sansa Clip Zip - Custom Rockbox Themes | Headphone Reviews and Discussion - Head-Fi.org