Yes, you can get it at office supply stores and even walmart. 3M makes it. It's double sided foam tape. Make sure that you wipe down the side of the servo with a little alcohol first so the tape sticks well.

Also, you have to have a non-porous surface in the airplane for the tape to stick to. The easiest way to do that is to put some epoxy on a small piece of plywood and then put it glue side down on a piece of wax paper. Clamp it down. When it cures, peel off the wax paper and you have a nice, smooth surface to attach the tape to. Epoxy the plywood in place in the aircraft where ever it goes with the smooth side (the side you just made) out.