Pre-holiday stuff (post-holiday we buy at 75% off at walmart for the following year)
seasonal things like pool toys/beach toys
kid's toys - you can get a whole bunch for not a lot - I went xmas shopping here for our kids since our cash flow was a little low due to my salary reduction. They loved the $1 toys at least as much as the ones that cost 5-20x as much.
stocking stuffer type things
didn't get them, but holiday mug gift sets with mug, card, and candy were $1 and looked really nice.
books and puzzles can be a good deal, but we have bought low quality puzzles that are warped and end up in the trash quickly.
Retired in 2013 at age 33. Keeping busy reading, blogging, relaxing, gaming, and enjoying the outdoors with my wife and 3 kids (4, 10, and 11).