HiPen H3 is probably one of the best budget stylus with the Hi13, that you can get in the current market. Be sure it's enough for your requirements though. It is for me. Maybe not for you.
Here is an unlisted YouTube list in which you see the HiPen H3 reviewed briefly with the the Hi13, and followed by later report vids showing the sample issues that you might face: Chuwi HiPen H3: http://www.youtube.com/playlist? ... 6NgqRfih6jFa1A0xh2I
Edit: added one H3 focused one I just found, to the end of that playlist, he gives his advice there and what he based it on.
Hackerjac replied at 3-25-2017 12:17
if you look at the pic of the pen where the clip is, it might be buttons at the buttom of the pen
Yes! I see it now. But according to 2 other images with other orientations, that "volume style rocker" button, is very "flat". It could make accidental presses less likely, and nicer experience when writing, but I wonder how it is when using the buttons.