At the I-526 stage, there are $500,000 investment fund, $20,000 to $50,000 administrative fee, $1, 5000 USCIS filing fee for I-526 petition and attorney fee if you obtain a lawyer for prepare the filing. If you are going through consular processing, there are immigrant visa fee, medical exam fee and attorney fee if you acquire a lawyer. If you are going to adjust your status in the US, there are $1,070 USCIS filing fee for I-485 application, medical exam fee and attorney fee if applicable.
At the remove condition stage, there are $3,835 USCIS filing fee for I-829 petition and attorney fee if applicable.
All filing fees are from current USCIS website, subject to change by the USCIS and the immigrant visa fee are vary from country to country.