What a day. I get to the store at around 2:00. I see the same guy that I bought them from yesterday. I walk to the box of Opus's and no price is listed. So I tell the guy, "hey, I think you undercharged me yesterday. I only paid $30 for all 4." The clerk is whispering, "no, no...i charged you the right amount." Low and behold, one of the guys sitting on the couch turns up to be his boss and hears the conversation. He asks for the last 4 digits of my credit card to pull up the previous day's transaction. Turns out the clerk had given me his employee discount...which he really wasn't supposed to do by the look on the boss's face. I paid the difference to try to keep the guy out of trouble, but I don't know. He may be in some trouble.