There’s this service called metabook that facilitates selling books that you no longer need / want and buying them from the seller. I had two in excellent condition collecting dust for many years:
- UNIX Network Programming: Interprocess communications
- UNIX Network Programming: The sockets networking API
The warm feeling I used to have by just looking at them was gone though. But I could see the spark in the eyes of their new owner. He too said he got them for sentimental reasons.