If you want to sell prints I have to assume you want or need to print a lot.
You are in India, one of he countries were people still get creative on the most basic of levels, use that ! 
And open printer in a humid environment is not a great start but a fixable one.
Get a small bar fridge or slightly larger depending on your filament needs.
Does not have o be a working one, only needs proper seals.
Add some nice rods to hold your spools as well as a fan forced heater - there is very cheap ones available for just this purpose, filament drying.
Like those electric frost prevention heaters some people have in their bathrooms, just much smaller so you can mount a PC fan to it.
Also get a cheap, digital fridge controller - they can be used for heating with no issues.
Of course you also need a proper way of dealing with the humidity…
That is the tricky part here with your humidity levels during the rain season.
Whatever moisture you have inside the heated fridge can only get out if the temp inside is high enough while the dew point outside is also a match.
The later is your biggest issue here as you need to get creative.
I just assume you have some basic tools, a creative mind and capable hands…
Two possible ways to get the humidity inside the fridge low enough:
- Use silica gel beads and recycle the soaked one using a microwave and digital scale.
This ideally means that you force the circulating air through the silica gel.
With a fan that means using a large diameter ‘pipe’ of sorts with air channels insides to keep the beads in the other areas.
Also means a lot of keeping up and checking, which makes a proper hygrometer essential. - If you go slightly above bar fridge size or build a custom dryer box of large size a dehumidifier of the electric kind is helpful.
You CAN place them inside the box/fridge if you won’t have to heat the insides above 60 degrees Celsius.
A better way is to have the thing outside the box and to just modify it so the air in- and outlet will go through the fridge/box.
Since these machine already come with a hygrometer so you can adjust it to your needs you only need a normal one for control reasons.
For obvious reason you should still keep a generous amount of silica gel beads inside…
The limit is only your imagination, so choose wisely and check if there is not cheaper options available for the things you need - get creative