I recently sold all of my MFSL records (many still sealed) for $50 each. Considering that I bought each for $13.99, I was thrilled. I just saw one of them for sale here on Audiogon for $175. I mention this as I have a ton of CDs that I bought for an average of about $5 each. Half Price Books would give me $1 each if they recognized the name, and they didn’t already have several of the same title. My stash is mostly 60’s and 70’s rock CDs, not the uber sophisticated jazz CDs that your pal may have collected. I don’t have experience with Jazz recordings but I would try to lower his expectations. Unfortunately, used CDs don’t command the premiums they once did. Just my two cents.
Try checking discogs.
Try checking discogs.