Artex stippling brush needed

Hi all

I have no idea where to post this so feel free to move to the relevant spot.

I posted it here as I am in Udon at the moment and if there is anywhere here to get one all the better but anywhere in Thailand will do.

I have never seen them in Homepro or Global but thats not to say they dont have them in the bigger branches.

I am looking for a stipple (Artex) brush to imprint a pattern on mortar. any suggestions ?

Thanks in advance