Target is advertising the newest Harry Potter sets this week. Two of them stand out to me 75950 Aragog's Lair and 75956 Quidditch Match. Both of them are at or below the Golden Ratio and they look like they have interesting or useful parts.
Also, I've found more Clearance sets at Target.
70914 Bane's Toxic Truck Attack for $34.98.
70916 The Batwing for $82.98
70921 Harley Quinn's Cannonball Attack for $34.98
75102 Poe's X-Wing Fighter for $46.18