We're compiling the best Holiday 2016 music gear deals. See them here.
The Korg X3 is cheap to pick up nowadays and gives you a good keybed with instant access to some classic (but somewhat dated) Korg sounds from the M1/T1 era . It does not have a lot of realtime controllers (knobs etc...) so will require some menu diving (luckily it does have an LCD to help you out with that. In that price/sound range you might as well look into an 01/W or Wavestation or the excellent Korg Legacy (VSTs) which have the M1 and Wavestation with all the extra sound cards.