Holy smokes! (literally...
)
I would most definitely try to make a case for your cause at Best Buy. You are having an amazing stroke of bad luck. My SC-05 has given me no problems, whatsoever, and I fire it up just short of daily with a 7.1-channel system.
There may be some bad news for you. BB might not have any SC-05s left in stock!
I'd act very fast!