Amazon offers downloads of StarCraft II: Wings of Liberty for Windows / Mac for $9.98. That's the lowest price we could find by $5, although we saw a boxed version for $2 less last week via in-store pickup.

Also available are downloads of StarCraft II: Heart of the Swarm for Windows / Mac for $9.98. That's tied with our September mention as the lowest price we've seen. (It's also the best deal now by $3.)