There is a fine market in TM500, 24xx scopes TM5000 and 7000 scopes and plugins.
The 500 series is huge and power hungry, now over 60 years old.
Most interesting to collectors and restoration folk.
VERY bad to ship, cost >> value and easy to arrive damaged.
Ebay is the wrong venue.
Best place to find is ham radio fleas or Craigs List local.