I brought mines at $5 each from Franks Aquarium. I was lucky he was only 10 miles away, so I didn't have to cover the shipping cost of $30.
If you do a search for Cherry Red Shrimps they go for $4.59 to $9.30 each with $30 overnite shipping.
I'm offer 12 on Aquabid for a starting price of $1 with no reserve.
So the price can be anything since it's a true auction.