Cowon X7 might be an alternative.
Was looking at this a while back myself, simply put there's almost noone doing HDD mp3 players anymore. They're all ssd and hella expensive if you actually need a decent amount of space.
EDIT: turns out they don't make the X7 now anymore either.
only real options then are SD card based MP3 players that support 64/128gb memory cards.
Cowon & (Sandisk) Sansa are what come to mind for brands