Adjustable height desks do not necessarily mean 'sit-to-stand' desks, however in recent years there has been a lot more data supporting the health benefits of 'sit-to-stand' desks and are increasing in availability and popularity. The major limiting factor is price.
A simple fixed-height desk is a lot cheaper than an more engineered design with moving parts, however prices are coming down. Crank adjustments are the cheapest, then pneumatic and electric motors are most expensive.
Some companies make custom designed desks that are tailored to the working area and space available. Costs savings can also be made where the desktop surface if removed can be placed on a frame that will adjust in height.