。
Fur coats are on sale.
Literal
Fur [possessive-の] coat [subject-が] special-sale-in-progress is.
特売中 ('during a special sale') is the Sino-Japanese compound 特売 ('bargain sale') + 中 ('during, in the middle of'). 中 as a suffix is highly productive, attaching to any state or activity noun: 勉強中 ('studying'), 会議中 ('in a meeting'), 営業中 ('open for business'). です gives the polite statement.