Seattle-based Costco is getting into a new line of business -- home mortgages.

The members-only retail giant has been quietly testing a mortgage program for the past year. Its partner in the effort is New Jersey-based First Choice Bank, which will work with affiliated lenders.

The website for the new service is already online -- But some of the site pages promising additional information aren't working yet.

The Costco program offers members quotes from different lenders, but the Costco member's identity is not revealed to the lenders until the member officially selects one, John Alexander, business development director at First Choice, told CNN Money.

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