Sometimes they have really cool athletic socks that are perfect for cycling.
When they do have them in stock, I usually will buy them all. =)

Some other stuff you can get-

Sunblock/lotion
playing cards
notebooks/journals
pens
pots/pans (cheap = lightweight)
beanies
electrical tape
matches
tupperware
coffee mugs

Also, I've found some killer deals on stuff at thrift stores. Found an entire camp cook set for .75.