i have also stocked up on bits for elf allready -
iceland (uk food store) had a tub of 40 xmas mini chocolate bars for £2.99 (i think) all had pics of santa, reindeers and snowman - ideal as treat for kids
from ebay i have got the older 2 a "boys" bracelet with their name on and for the toddler a wooden watch bracelet.
and from another seller i got 3 xmas tree craft kits - fridge magents, foam stamping and something else.
plus in £1 store i found the "grow your own" bits and got a santa, snowman and reindeer.
qs (clothes store) also have a variety of cheap xmas craft kits like bookmarks, magnets, puppets all were under £3.