Bumping this three year old thread...
I have more than sufficiently used a cheap $3 universal adapter for decades, happened to see online the Anker European one with two USB ports (currently on amazon for $15.99 - $3 coupon), which got me thinking it'd be nice to upgrade to a modern one. Anyone have, or seen/recommend, a universal version that doesn't cost an arm (ideally less than $25)? I have trips to AU and PL later this year.