They have put two of the three Kobo ereader models they carryon sale today for $20 to $30 off. The Kobo Clara HD is now selling for $99, and the Kobo Aura 2 for $79.
Both models ship for free, they both run the same software on identical CPUs, and they even have similar touchscreens and color-changing frontlights.
The one key difference between the two ereaders is that the Clara HD has twice the storage (8GB) and a higher resolutions screen (300 ppi vs 212 ppi on the Kobo Aura 2). The Clara HD is also a little lighter and has more options for controlling the frontlight.
Given that it's only $20 more, you’re better off getting the Clara HD. On the other hand, the Aura 2 is marked as clearance, so it might be worth waiting to see what device Kobo will be launching next.