Amazon has clearanced a bunch of its infant-sized costumes, but they are going like hot cakes. Most of what I am seeing is available right now in the 0-6 months and 6-12 months sizes.
Star Wars Clone Troopers – $5.75
Madeline Coat and Hat – $5.13
Shrek Romper and Headpiece – $6.09 (for 0-6 mos. only)