I buy a lot on line. A good deal of what I have bought for Christmas this year, has been internet purchases. With free shipping or a flat rate, it's cheaper and less of a hassle than trudging around, store to store, to find what you're looking for.

Things I buy - just about anything.

Pet meds and food
Books
Clothes, Birkenstock sandals, handbags
Jewelry
Small appliances
Quilts/comforters
Electronics
Collectibles

About the only thing I stay away from is food. I once bought a Cajun turkey breast from QVC, but shipping costs really put the price up too high.