You are probably safer using your c/c online,making sure it's a secure site-HTTPS:- than in a store.With the new cards and scanners that can read the number while in your pocket and the scammer card readers installed in places like gas stations I feel safer online ordering than just walking around a store.I've opted out of the new cards.
Best Buy is pretty easy to find their sale things in stock,mainly because the prices are a little higher than other places. But they do have a decent selection of products.I get most of the stuff I just have to have there and usually can find it in the "open box" isle.
I remember when I got my first 19" tv.It was called a portable tv,weighed about 100 pounds,had 5 channels to watch,now even my computer monitor is bigger. And I can even use my big screen tv's as a monitor.