These Fireman Sam children's slippers are a super bargain at Argos. Most sizes are now £1.99, with just size 9 at £2.99. I know now is not the season to be buying slippers, but the autumn is a couple of short months away, and it's worth buying these in advance at this price!
These come in sizes 5 up to 9, and all except the largest size are £1.99, with size 9 still a bargain at £2.99. The link above will take you to the smallest size and you can use the drop down size box to choose the one you need.
Some of the reviews are saying that the fit is a little small and they advise going up a size if your child has wide feet. There are plenty in stocks in all sizes at the moment, both for collection and delivery.
Thanks to Wadjet @ HUKD