Best Buy offers the Starcraft II: Heart of the Swarm Collector's Edition for Windows for $39.99 with free shipping. That's tied with our September mention as the lowest total price we've seen for this edition. (It's a current low by $30.)
Note that this requires a copy of Starcraft II: Wings of Liberty to play.
Most taxpayers will see their tax bill go down during 2018. That could impact which type of account -- traditional or Roth -- makes sense for you.