V For Wikipedia has just dropped 33% off from $5.99 to $3.99. One of the nicest iOS Wikipedia apps around with attractive reformatting. I switched to it when Wikiwand stopped working on my iPhone. Lets you view Wikipedia articles for nearby places, shows most-read articles around the world, has an image gallery browser built-in, and has an Apple Watch app as well.
(FYI another nice Wikipedia app, which offers a mindmap view of entries, is the $4.99 Wikiweb [not on sale].)