Needed a pair of the black ones for myself and was looking on Amazon before I went to bed last night where they were £24.60. Checked again this morning and they're now down to £23.37 so I've just ordered a pair.
White - £22.89
Red/Black/Maroon/Mono Black/Purple - £23.37
Pink - £24.60
These are usually £30-40 on the high street.