limited-time sale; time-limited special offer
Wasei-eigo from 'time service'. Refers to a short-term discount or promotion in stores, similar to a flash sale. Often used in retail and supermarket contexts.
wasei-eigo (Japanese-coined English), from time service
See also: タイムセール
The supermarket was having a limited-time sale, so I ended up buying it.
The prepared foods were half-price during the evening time-limited sale.