Hopefully this will help someone else out - have been looking for an Adult bike helmet for myself and 2 x childrens helmets, without breaking the bank.
Halfords are doing 3 for 2 on most cycle accessories so I've popped down over lunchtime to take a look.
However, they are also doing a half price Bell Avanti helmet (£14.99 from £29.99) if you buy any other accessory and to my surprise, both deals were put through at the checkout.
So, I ended up buying:-
Bell Avanti adult helmet - £14.99
Trax Furnace childrens helmet £9.99
Trax Furnace childrens helmet £Free
The big upside of course is that the 3rd item can be any cycle accessory and you'll get £10 off the price. It's also worth noting that the best online price I've seen for the Avanti helmet alone is £20+.
Appreciate not everyone may be as lucky in-store. However I've lost count of the number of times I've benefitted on such a deal and am long overdue in posting a deal of my own..