Nintendo Wii 3 in 1 Quad power station with batteries - £14.99 on the web.
My better half just went to Argos and the in-store price was £29.99. She even took a box to the checkout to verify it - same result.
I checked on the web and did a "reserve and collect" - went back to the same person on the same till and hey presto! Half price!!
Maybe it's just our local Argos that has their shop floor pricing wrong - but it's worth mentioning? (Be kind - it's my first post!)