Check out how one retailer I saw was quitting unsold greeting cards. Cards were in cardboard boxes and shoppers needed to leaf through to find product they wanted. There was no shortage of shoppers prepared to browse the heavily discounted stock.
Sometimes a no-frills approach works best.
I have at times had to quit some old card stock. My approach has been to sort and re-package it. Then at appropriate times I display carefully in an open buy section, providing some variety. Time is on my side and I have pretty much obtained RRP. We also sort and save envelopes, and when able can sell coloured stock or sized stock to crafters ( or even one bloke who was desperate for 6 more silver envelopes for the wedding invites !) Mostly I charge a fee but then add ” we’ll put that in the tin on the counter for “rspca” or “relay for life”. I dislike the “dollar box” stuff, I don’t want my store to be a discount centre.