Aldi have got a selection of kid's travelling comfort seats instore from Sunday 11/05/14 priced at £6.99 each which seems pretty good.
Product Information :-
Travel accessories to help kids sleep comfortably through the miles.
Set includes: Ergonomically Supportive Neck Roll and Fixable Sleeping Cushion
Choose from: Butterfly, Ocean, Giraffe, Flying High or Cats