I already have 2 recs from professors. I was thinking about getting a third rec from my supervisor at work. My job is along the lines of Staples / Office Max; I've been there for a year. It seems that most of the employer recs that people submit are from professional jobs. Something is telling me it would be immature to send a LOR from my supervisor at a retail store. On the other hand, everyone says to use people who know you the best. The supervisor knows me well and could add a more personal side that the academic letters are lacking.
Should I just send the 2 academic letters or ask the supervisor for a third one?