As a complement to Lexikaliker’s yellow Wopex, here a photo of the yellow Wopex blister pack available in the UK. I bought this pack of five Wopex plus eraser and sharpener this April for £2.991 (~$4.69; €3.70). Unfortnately I haven’t seen the eraser-tipped version from Lexikaliker’s blog post yet, but I will definitely buy it if I ever see it.
East…West…Everywhere wrote a blog post about the green version, available in the USA, that comes with Staedtler-made eraser caps. These eraser caps are basically a white version of the eraser caps that are quite common in North-America2.
Price: April 2012
Exchange rates: June 2012