I think Valve realized their opponents have those in their stores so they’ve added it: http://store.steampowered.com/news/3158/
At least they’re showing all currencies now:
Browse for the Top Games Under $10/£7/10€ or Top Games Under $5/£4/5€ and find the day’s top-sellers.
Yeah we all know one dollar IS one euro…
Games Under 5€