You can check Insta profile of ‘Sindh in a jar’ and maybe they can deliver where ever you want. Also there is a website Kokee.in and they too deliver pan India.
Do let me know if you can get through these, else I can connect you with some other sources.

Hello Alka,

I live out of India, do you know any ladies in Mumbai, who can make this achar for me? I will pay and have it collected if there are some persons who do this, and coming from you will be good quality .

Rajapuri kairi works best but you can use Desi kairi or even Totapuri Kairi.

Absolutely. Just fill the jar with the pickle leaving a head space and then pour some heated and cooled mustard oil. The oil floating above the pickle will reduce the chances of pickle getting spoiled.