Omnidesk Pro 2020 122cm from $635. 153cm from $700. 183cm from $765.
Kenshi from $440.
I snapped and bought one - I managed to add a free cable management bar. Seems like they turned that off now though?
$50 delivery fees included. Yeah I added delivery for you since it's a flat $50 fee.
Mod note: Delivery fee is not flat $50 as claimed by OP. It is variable and it depends on the destination.
Recently purchased a dual-motor standing desk frame for $300 after negotiating down from $369 with Amazingooh. Frame height adjustable from 60-125cm, 120kg capacity and 36mm/s speed. Comparing all the dimensions and shape of the frame, it appears to be the same item as Desky for less than half the price (not sure about the actuators though).
Can't speak for long term usage as I've had it for around a month, but $300 price means it can be an instant tax write off instead of having to be depreciated over 10 years. Might be worth a look for those shopping around