Tulsi Plant Where Can I Find?

Temple is usually the best source. In my area people grow lots of seeds and donate the tulsi plants to the temple for sale in spring. If you want to grow from seed Select Seeds and Johnny Seeds have holy basil and they are reputable suppliers.

 

you can find it in temples always specially during summer events as @malstorm suggested . i also bought it from apna bazar and sabzi mandi in the past . Out of 4-5 such small plants from all the above places finally one survived and thriving . same happened with indian jasmine plants for me . out of 4 from different places one finally bloomed .