If you learned from last year, and the year before that (and the year before that), you would have a little bit of extra cash saved to get some Post-Christmas goodies, like this awesome Xbox One S deal:
Microsoft has announced a promotion between them and retailers such as Best Buy, Amazon, Walmart, Target and Gamestop, that if you buy an Xbox One S you will receive a free gift. The promotion ends just before the 31st.
Console purchases at Best Buy, Amazon or Walmart: a free Xbox wireless controller alongside the system
Console purchases at Gamestop: a free Stereo Headset in either white or black colors alongside the system