Government amounts for the petition to remove conditions appear in the current USCIS fee schedule, Form G-1055. Legal fees for that stage, and any accountant or expert work needed to evidence job creation, are additional and are often overlooked.
Budget for a filing that happens years later
Hypothetical example: the family budget the capital, the sponsor's administrative charge and the first legal bill, then meet a further set of costs two years after arriving. Plan for the whole sequence. The initial stage carries government amounts per the current G-1055 schedule, immigration counsel, source-of-funds preparation, translations and the sponsor's administrative charge.
The later stage carries its own government amount, counsel to prepare the removal petition, and possibly an economist or accountant to present job-creation evidence if the project's reporting is thin. Ask now what the sponsor provides at that stage and whether it charges for it. Set the money aside rather than assuming it can be found later, and confirm current amounts from official sources rather than from an older article.