Target started their spring clearance last week. But it looks like some LEGO deals are rolling out a week after the other toys. Prices are 15-30% off, and it seems to vary store by store which sets and price. Here's what I picked up at a Target in Arlington Heights, IL:
70705 Bug Obliterator - $56 (originally $80)
70704 Vermin Vaporizer - $42 (originally $60)
3920 The Hobbit Game - $17.50 (originally $35)
Other places I looked only seemed to have things marked 15% off, but keep your eyes open.