I donated a dozen or so bikes and some electronic stuff to a second hand store recently.
One thing was a Welltech DVD player that I bought out of the Lidl supermarket for £8. I gave them all the box and accesories.
I looked in the shop window and there was my old DVD player. Had a ticket on it, down from £30 to £15.
Most shops will charge about that for a new DVD player. So they were way too pricey for a second hand one