The Star Wars FX Emperor Palpatine Lightsaber - or Darth Sidious Lightsaber, really - is $249.99 and coming out later this year.  It's one of the fancier models, like the Darth Revan one due to ship pretty soon.  The lightsaber blade is indeed removable, and it includes a display stand.

You can order one at sponsor Entertainment Earth or affiliate, Amazon. Hasbro marketing copy says:

STAR WARS: THE BLACK SERIES EMPEROR PALPATINE FORCE FX ELITE LIGHTSABER
(HASBRO/Ages 14 years & up/Approx. Retail Price: $224.99/Available: Fall 2020)
With the STAR WARS: THE BLACK SERIES EMPEROR PALPATINE FORCE FX ELITE LIGHTSABER, featuring advanced LED technology and movie-inspired sound effects, fans can imagine STAR WARS action and adventure. The real metal hilt features design and deco based on EMPEROR PALPATINE’S iconic Lightsaber featured in STAR WARS: REVENGE OF THE SITH. Press buttons on the hilt to activate movie-inspired sound effects, progressive ignition, battle clash effect, wall-cutting effect, and lightning effect. Proudly display this Lightsaber on the included stand, with or without the removeable blade. Requires 3 1.5V AA batteries, not included. Includes Lightsaber, stand, and instructions.