🚀 go-pugleaf

Hi, I am looking for a device that will give me the orientation measurement 
of a mobile robot. Of course, the first thing comes into mind is the compass, 
however, the compass suffers from the the effects of external magnetic 
field and acceleration. Now I turn my attention to gyroscope, here the 
problem is the cost. Does anybody know any companies making some reasonably 
cheap gyroscope? I do not require very high accuracy, ~+-0.5 deg or even 
a little bit larger is fine, and also I do not require very small drift 
over time. Are there any other devices I could possibly use to get the 
orientation information. 

Thank you in advance.