I also prefer to shop alone but it's because I want to go into the stores I want to go in, and spend however long I want looking at things. I don't want to have to compromise with another shopper.
I rarely go into the mall with a mission, I could literally spend hours just walking around and browsing things - something few of my other friends enjoy.
Scuba - seriously check out the DSW in your area. If you register online for their little membership club, they will send you a $10 off coupon and the guy at the store told me they are good for YEARS after they expire. And you get points.
I'm crazy about membership stuff like that. I feel like most people get annoyed by the sign ups, the cards and the e-mails but if you take the time to weed through it, you can get some awesome deals. I can't even begin to tell you how much stuff I have gotten through Bath and Body Works, Victoria's Secret, American Eagle, Ulta, Sally Beauty etc....