For freebies, ATA has the ULTIMATE cookies. They are only served on morning flights, so lately we haven't had any. But when we lamented to a sympathetic flight attendant one night, he presented us with a barf bag full of them!
For purchased items, ATA is currently selling "meals" (sandwich or salad variety) or snack trays on some flights. I haven't tried a meal yet, but the snacks are pretty good. For $5, you get blue chips with salsa, a Milk Way candy bar, crackers with peanut butter, a bag of raisins, and the most godly M & M/chocolate/shortbreak cookie bad I have ever tasted. The finger good items are great to keep the kiddies occupied.
Barb