Q.buying seeds
Interested in growing tomatillo plants in my area. Can you help me out and where can I buy the seeds or plants?

Here is growing information for these plants. which can normally be attained from most garden centers or nurseries. You can also perform a quick search online for your local area to find retailers nearby.
https://www.gardeningknowhow.com/edible/vegetables/tomatillo/growing-tomatillo-plants.htm
https://www.gardeningknowhow.com/edible/vegetables/tomatillo/harvesting-tomatillo-fruits.htm