anyone know a place in bkk selling ? 

I see many, many on FB daily. Look there, you'll find plenty.

 

Smaller grows use the CO2 bags.

 

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thank you. im not on the facebook but wife is. ????

 

Unless you have saturated light at an industrial scale grow set up,  carbon dioxide will never be a limiting factor.  If my assumption that its smaller scale set up is correct,  save your money.