After purchasing ear buds hoping to help with air ...

After purchasing ear buds hoping to help with air pressure relief during flight, I came across the exact product I needed at a different store in the airport.
I returned to the original store, Flight Stop, to return the ear buds purchased 20 minutes earlier, but instead was confronted by the salesclerk with a placard stating all sales are final. This contradicts the printed receipt which allows for returns and a full refund within 30 days of purchase.
Long story shorter, we were refunded in full. It took 45 minutes to do so, and required waiting on an angry manager. Had we been in a hurry to catch our fight, which is normally the case, we would have had to let this go.
Buyer beware here!!!!!!