Where to shop in Las Vegas?

I will be heading to Vegas at the end of April (I am staying at Rio Hotel for three nights~)
I have been researching on what to do and where to go for food
but haven’t thought about where I should go to buy stuffs
I found premium outlet and other big shopping places
but I am also interested in those “hidden??” or “secret??” places only local people knows about….(if there’s any)
I realize pawn shop there is pretty big compare to any other cities in North America and want to know what they sell and how cheap those stuffs are (I am mostly interested in electronics and clothing)
OR IF you have any suggestion on where to shop in Vegas
don’t hesitate to leave a comment!
THANKS ALL~