(A) I saw a convenience store where I was born and grew up.
(B) I saw there was a convenience store where I was born and grew up.
If you mean that the store is where your house used to be, you need more words. The sentences seem to mean that you saw the store in that town or neighborhood. Version (B) is a little better in that regard.
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If you mean that the store is where your house used to be, you need more words. The sentences seem to mean that you saw the store in that town or neighborhood. Version (B) is a little better in that regard. Maybe:
"I saw they had built a convenience store on the spot where my childhood home used to be."
"I saw a convenience store where the house used to stand where I was born and r