Unfortunately many business will never decrease their price despite exchange rate fluctuations. As said above, they would not be seeing any benifit of the improved exchange rates yet for a couple of reasons, 1) warehouse with stock bought at old exchange rate 2) many businesses forward purchase currency to protect against unpredicted drops in the exchange rate.
I know in my case when August last year we had a HUNG parliament and an exchange rate of $0.87, we could only see the exchange rate going one way, down. So we forward purchased most of the money needed for the next 6 months. This was a bad call but who would guess that we would be still be on parity 6 months later. Not us.