Went to Tesco and they had BOGOF offer on oral care products- include toothpastes (aquafresh, few colgate), brushes, some battery operated brushes, kids brushes, floss etc. Includes kid's pirate battery operated brush
Offer is not all brands/products, so see offer label before buying
Cheapest paste was tesco whitening toothpaste for 49p, so with offer you get 2 pastes for 49p - not bad.
It is also online
offer ends 10/5/2011