Also, check with your college for retailers coming to campus career center or career fairs. That is how must retailers seem to recruit for entry level buying positions these days - they will call it "buying assistant" or planning manager or something else but you will need to start somewhere :)
As for stores, I hate to say that most companies don't make the transition from store side to buying side easy. I have experience in both but times have changed. WIth computerized distribution programs and cost/margin control done by computers, things have tightened up in the industry.
What is your major? Make sure you are taking some business and accounting courses.