From the "For what it's worth" department...
I was in the Kitchener Future Shop yesterday (Friday) to see about a SA8300HD. They were on for $549 last week (I was out of town) and I had a $50 off coupon that I'd printed from their website.
Turns out the STB was back up to $599 this week and, the salesman said, I wouldn't have been able to use the coupon on a sale item anyway. I wasn't sure that was true since I printed the coupon from a link on the $549 FS 8300HD webpage but...
I told him I didn't want it if I couldn't have it for $499 and I'd just wait until they were on sale next time. He told me to wait a minute, ducked into the backroom for about 8 seconds (literally) and came out and said they could do $499. He said the wholesale price had recently dropped to $434 so they would do $499 amd still make a few bucks.
In addition, they threw in a new SA1840SD for free (though, god knows what I'll do with it).