I'm currently visiting family away from home and my windscreen fluid ran low so I figured I'd just drop into a dealership and pick up a bottle of the additive (being all anal and such).

Apparently VW aren't using the 1L bottle anymore, instead using a new 500ml bottle.

The old part number was VG052164M2 and cost me $10.30 (ex). The new stuff is listed as VG052164ML and cost me $10.35 (ex). So a 100% price increase

I've still got a few 1L bottles at home so I'm good for a little while, but is there any source for the VW 1L (or bigger), failing that what do people use?