You'll need to be more specific. Most treaded robots can climb anything,
including stairs. Some cleverly designed wheeled variations can also
climb stairs. A more complicated, yet elegant solution are legs. And in
this case you're right, in that practically no one sells such a robot
due to its disproportionate high cost to low usefulness ratio. What's
more, few hobby-oriented robotic products do anything useful or
complicated. So if a company did sell a robot capable of climbing
stairs, it would probably break the bank.
In other words, ramps are still the easiest way to traverse stairs ;)
Size? Price range?
You better have A LOT of money for a robot that can reliabily climb
different kinds of stairs. This is still something of a Holy Grail for
robotics, and the robots that offer this are usually prototypes that are
not for sale.
With enough money it's possible to build a stair-clibming robot. Whether
it will climb all stairs, especially while not destroying the surface
(carpet, tile, whatever) of the stairs, is another matter.
Author: Constructing Robot Bases,
Robot Builder's Sourcebook, Robot Builder's Bonanza
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