I've been a DTV subscriber for about 10 years. In attempting to upgrade on-line, I am being asked for an offer code to get a good price. How do you get offer codes? They've never made me any offers other than to pay my bill. I am looking to get a HD-DVR unit to go with the other three receivers in the house. I've seen mention of prices from $299, $199, $99 and free. Free sounds good to me. Anyone know any good codes that will help get a discount?