Anybody know where I can get Borax - Boric Acid - Diatomaceous earth. They are the only really efficient cockroach killers. I saw one in my condo but I want to be sure that if another one turns up it will take the poison back to the nest.

You can buy both products online from :

https://www.chemipan.com/i/en/a1/ , product, general chemicals... Bangkok based and worldwide deliveries. Don't know of any place in Pattaya selling chemicals.