Have the client hire a moving company to pack and move the display to client provided storage (their garage, public storage whatever). Assist them with the uninstall but let them handle the rest.

Let the client know that you do not sell products for clients. Suggest that they list the products on Videogon/ebay/craigslist. If it sells great if it doesn't its not taking up space in your warehouse and you aren't fielding the "did it sell yet" calls.

I think Rick is spot on with his estimate of $8k max. Maybe if you get lucky and find the one guy who really really wants that TV...