tokous.com
Small but angled for leverage; keep it in my fanny pack with an extended Phillips/Pozi head loaded and ready.
I have this very similar one with a longer pozi#3 from blackdiamond; probably from same overseas factory. Used to be locally avail in brick and mortar for $9.95 from REI but turning more obscure.
For backcountry binding adjustments and equipment repairs, the Binding Buddy is an indispensable tool....
www.blackdiamondequipment.com
Obtaining a standalone longer pozi#3 bit probably costs as getting the entire tool itself. I keep in my boot bag, but I do not carry unless I know I will be planning on swapping skis on the mountain with a buddy.
I've found the the Resort Tool Stations (at least in US) usually only are setup with a standard Philips screwdriver not Pozi.
It seems to be targetted more for snowboarders who got to fiddle with their binding angles and straps all the time, vs ski bindings which only have 1 "correct" setting to be adjusted only by a certified binding technician and then ATSM tested, RIGHT? [Snowboard bindings use Philips, not pozi].
Usually though the philips has been blunted enough though that you can get it to turn the pozi screw if you really need to.