Hi there, @rabindramishra!
It depends on where in the world you're trying to purchase from. [link|https://www.ifixit.com/products/google-pixel-5a-screen-genuine|Here is a link to the part in our US store|new_window=true] (check [link|https://help.ifixit.com/article/45-international-shipping|this shipping list|new_window=true] to see if we can ship to you from there).
And [link|https://www.ifixit.com/Guide/Google+Pixel+5a+Screen+Replacement/148892|here are the instructions|new_window=true] to get it done!
Hope this helps.