I'm looking for deals too but haven't seen any. Amazon has them for $50 ($10 off) right now but that's not too great of a deal. Wait for them to have it for $40 again like they did a few weeks ago unless someone knows of something better
My Gold membership is set to expire in about a week. I've got several Silver accounts that were recently showing a $2/2-month offer on their dashboard.
I'm set to revert to Silver when the time comes in hopes that the same offer appears on my primary gamertag/profile.
I've already had a credit card on file for years now. I only buy MS points occasionally with it and there is NO Auto-renewal set for my subscription though I hear that it is again easier to remove the auto-renewal that takes effect after you accept the dashboard offers.