I need a place to put 2 large suitcases

So we are in bangkok right now and bought 2 rather large suitcases with us becouse we wanna shop here.
But we will leave bangkok to ko phangan for about 18 days and we wanna backpack so we want to leave our suitcases in bangkok for said time.
I know there are places where you can drop them off but they sre rather expensive for this timeframe so i wanna know if anyone with maybe a condo here would like to store them for these 20 days for like 2k baht?

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