This is the 14173rd most frequent Russian word.
оптовом
Wholesale.
The word "оптовом" is used here as an adjective in the prepositional case, modifying "магазине" to describe the type of store (wholesale).
Мы купили товары в оптовом магазине.
We bought goods at the wholesale store.
"Оптовом" here is an adjective in the prepositional case, modifying "рынке" to indicate it is a wholesale market.
На оптовом рынке цены всегда ниже.
Prices are always lower at the wholesale market.
In this sentence, "оптовом" modifies "предложении" in the prepositional case, indicating the type of offer as "wholesale."