For yourself alone: US$15,000 nonrefundable to DHS, then US$1 million given when instructed after successful vetting. If your spouse joins, the couple total is US$2,030,000. Other government, medical and professional fees sit on top, and only that US$15,000 carries an explicit nonrefundable label. Where a headline and an official page disagree, the failure is usually reading a corporate number as a personal one, or a proposed tier's number as a current one. Establish which of those you copied before building anything around it.
Where the larger figures come from
Corporate sponsorship uses different numbers, US$15,000 plus a US$2 million gift per sponsored employee, and headlines often quote those, or a tier that has not launched. Sequence matters too: the fee is paid at application, the gift only when you are instructed after vetting. Budget in US dollars, hold the gift amount available for the instruction, and do not send funds ahead of it.
Budget the parts that are not the payment at all. Medical examinations, document retrieval, certified translations, professional advice and cross-border tax work each carry a cost of their own, and none of them appears in a headline. Currency is a separate exposure, since the amounts are set in United States dollars while the funds usually sit in Canadian ones, which makes the date of conversion a decision rather than a detail.
Confirm every current amount on the official page on the day you commit, and note the date you checked.