Hi, these sort of mounts are pretty cool if you are semi-stationary but need adjustment:
Neewer NB-35 or 39 [U$15] (on Amazon but many different types from different shops)
NB-35 includes a pop filter (though easy enough to make with a wire coat hanger and stockings)
N.B. most important is to check that the mount mechanism/clip etc is compatible with your mic, you might need an additional clip to mount your mic, to the actual desk mount boom arm.
Generally, these type of mic boom mounts are used for broadcast, called a scissor arm, price anything from U$ 15 - U$150.
Easy search:
broadcast mic mount (remember to check for a compatible mic mount between boom and mic, i.e. the screw or clamp on the boom that will accept your mic)
The K&M 23850 [U$150] K&M my favorite mic stand people. Maybe not necessary but maybe it is...
