Bunch of general tips that I've picked up/heard about
-Since impressions are made in the first ~30 seconds of contact, a smile and a firm handshake can put you off to a good start.
-Answer questions directly, don't beat around the bush or dodge around something you don't want to talk about. Just be honest. But at the same time, don't throw anyone under the bus in anyway.
-Prepare for the normal interview questions, like others have said
-If it's a sales position, acting with some confidence is probably a plus. But don't take it too far.
-Show up for the interview early, and dress semi formal for a best buy interview IMO
edit: found this https://www.job-applications.com/best-buy-job-interview-tips/