The iPod Classic 5-7th gens are still pretty popular in the media player scene, All can have their storage modded and batteries are still available plus replacement shells if you care about cosmetic condition.
Cost more than new ones(not iPods) from Amazon/eBay etc but I’d imagine most of those are sealed and not easily serviceable.
For Bluetooth, there are adapters but no experience with those personally.
You’re paying for convenience, Quick I want some icecream so you either go to drive thru or a store, However the store doesn’t come ready to eat as you then need a utensil and usually they’re bigger tubs which most don’t want to eat in one sitting.
Drive thru will win as it’s quicker and no extra steps/storage etc.