出价 is a separable verb (离合词) meaning 'to bid' or 'to make an offer' (usually in an auction or negotiation). The verb 出 and the noun 价 can split: you can insert a measure word, a numeral, or a complement between them, e.g. 出了一个价 ('made a bid'), 出过价 ('have bid before'). The object (the thing you bid on) is introduced by 对 or 为, not placed directly after 出价.