I'm of mixed mind on Miuccia Prada. I still think her nylon bags (along with Kate Spade) are overpriced for what they are.
I've seen Prada at the Nordstrom Rack and some Loehmann's.
DISCLAIMER: I own two KS nylon bags, but I purchased them, both genuine, at deep discount. I wasn't on the hook for approximately $450 for two bags.