Every Tuesday I go to the XBox live "deal of the week," hoping to find RB songs on sale. In the past this happened quite a few times and twice involved large amounts of packs and singles at 25-50% discount.
Don't think we've had one in over a year now. Whenever it was that they cut the price on some of those old country packs.
I know it's not Harmonix's doing, but I really miss these sales as they usually have me picking up songs/packs that I didn't have much interest in originally to try them out. Makes me expand my tastes more than I would at full price and often playing the new songs leads to further purchases by similar bands.