I have been to this shop on several occasions. It is a weird place that shares premises with a discount perfume store. On every visit, I was able to purchase accessories (cell phone cases, replacement batteries) for very old phones. I was happy with every purchase. The only thing that bothers me is that the price was not stated beforehand, so it seemed that I was charged whatever the attendant thought he could get. I was once able to bargain the price of a cell phone case down from $20 to $5.
Bottom line: don't pay the asking price. You should be able to bargain it down.