"The best possible deal for BF4 is on 11/28, where there's a 3 hours period to get it for $25. This is from 4:10pm - 7:10pm PST. Use Wolfram Alpha to convert this to your timezone
If you miss this window, the price return to $35 for the rest of the day. However if you wait until 11/29, the price goes back down to $30. So be patient if you miss it. This is tomorrow - we're giving you a day's warning."