I have some ideas, but would love more. I try not to buy throwaway tat, and am happy to spend a bit. My ideas for anyone who may find them helpful
Coloured pritt sticks
Rollerball pens
Chocolate
Jelly beans
Chocolate covered raisins or cranberries
Novel
Paper planes
Magazine
Small Lego set
Travel clock
Undies
Christmas socks
Toothbrush and toothpaste (scraping the barrel here)
Other years I have put in
Dobble (Star Wars theme)
Felt pens
Paint your own photo frame or money box type thing