KS Lev Si Dropper Seat Post 
27.2mm Diameter 
65mm Travel (designed for road and gravel applications)
380mm Overall Length
Internal Cable Routing
Includes lever
$225 MSRP
Preowned in excellent working condition. You might need a new cable and housing (standard Derailleur cable/housing). SEE PICS.

Info from the web: 
LEV-Si BRIDGES THE GAP BETWEEN OUR PREMIUM AND ECONOMICAL DROPPER SEAT POSTS.

The LEV-Si is the ultimate fusion of functional excellence and budget-friendly brilliance, redefining what you can expect from a dropper seat post. With all the functional prowess you’d expect from the LEV lineup, the LEV-Si doesn’t cut corners on performance. It’s engineered to excel without compromise, offering you the best of both worlds. But here’s the kicker – it doesn’t break the bank. LEV-Si is designed to keep costs in check while delivering unparalleled performance. It’s proof that you don’t have to sacrifice quality for affordability.

Features
Designed for internal frame routing
Cylindrical upper clamp nuts simplify installation
More vertical head clamp bolt angle increases clamping force
Updated cartridge is more durable with smoother rebound
Reduced actuation force
Longer travel options
Alloy stanchion
Alloy mast
Adjustable air sprung hydraulic cartridge
Short insertion length to travel ratio
Compatible with all KS remotes
Remote sold separately
Price level: $$$$$