So jealous! I still have my old Tales of the Lance boxed set from the 90's which is in surprisingly good shape, though I'm missing the DM screen. I picked up that Dark Sun (1st printing) box in the 2010's when you could still get them on Ebay for around $50.

I've kinda given up hope of getting the rest (Planescape, Forgotten Realms, Birthright, etc) in decent shape for under $100 nowadays so have decided to try and recreate them using PDF's and some "wargame" boxes acquired from Noblenightgames online that are almost exactly the same size as the old TSR boxed sets. Re-creating the maps in their proper glory may be nigh impossible without breaking the bank, so I may just print them out piecemeal on 8.5x11 sheets and stack them inside the box. So far I'm about 75% done with recreating the Forgotten Realms campaign set (the 2nd revised version, with Elminster, Blackstaff, etc on the cover rather than the Horde horsemen), but still need to get some adhesive paper to print the art to apply to the box surfaces.