Target offers a LEGO Creator Christmas Set (5004934) for Free with a purchase of LEGO 30478 Creator Santa Set ($3.49). You must scan both to get the Christmas set at $6.99 for free. No limit on purchase (but hoarders please be nice)
Use REDCard for additional 5% off
Some are saying it's not working because they went through cashier, I did this through self checkout. this could be a Target glitch, with that said I'll say YMMV.