J & S are good. I've had stuff from them and can't complain at their prices.
I've also found this which has P'ed me off a bit cos I payed top whack for mine.
http://www.gearchangeonline.com/product_list.php?id=176
They still look good with the peek off.
A good tip when going for an Arai lid is if you try a medium in a different style then a medium in the Tour-X style will be exactly the same fit. They don't mess around with their sizes like some manufacturers do. That was useful info for me as the shop didn't have the Tour-X in my size so I tried a different style first and then the shop ordered a Tour-X in for me in my size.