Most of the OPI Nail lacquer you see below are in stained bottles due to breakage of other bottles during shipping or have misaligned brushes.

For the polishes in stained bottles, the polish and brush are fine and you can continue to use them as normal.
For the polishes in misaligned brushes, a simple switch of the brush from a similar colour polish and they are good to use again.

If you are not a fussy buyer, you can get these "imperfect" polish at a low low price as stated below...