add sale options to price tags,

color += green
size += wide
perhaps it would be more consistent to put this section under `.tag--price__values` below, like you've done with `.tag--price--wide &`

also, `tag--price--green` seems a little dodgy as a class name. perhaps `tag--price--sale`? or something?
a class name that refers to the reason for the class, descriptive of its use, rather than its color