Chinchex is super! They are really affordable and definitely cheaper than any other pesticide companies. I've been using it for almost 6 months, I don't see bed bugs anymore. My friends in Hong Kong told me about this brand, its really popular and common over there. you can purchase from chinchex .sg or from online amazon shop
w w w.amazon.sg/Chinchex-Bed-bugs-Insecticide/dp/B082TVPHPG/ref=sr_1_1?keywords=chinchex&qid=1579660063&s=gate way&sr=8-1