First, the good news.
Apparently, none of the local Sears locations carry the WM40, but their online price was good enough for Best Buy, so I walked out of the store with a new sub for $130. Or so I thought.
Once I got it home and unpacked it, I noticed some white marks on the top of the sub. I figured they would wash off rather easily, but once I removed the speaker cover, I was horrified to see white paint all around the speaker! It looks like someone was painting above the sub and dripped paint into it. Unbelievable. There was no paint on the speaker itself, fortunately, but it's going back just the same. I'd really love to test it, but I'm afraid of what else may have been done to it before it was returned the first time.
At least the price-matching worked.