Showrooming TVs at Best Buy is a bad idea, anyway. They distort reality.
The $35 cable? I won't fault them for carrying Monster - why not? I will fault them for not carrying off-brand cables at reasonable prices. Yeah, I get that you can't fully compete with online cables, but you can at least be within the same stratosphere. If a 5' cable is $5 online it shouldn't be $15 in store.