INDIANAPOLIS, IN--(Marketwire - Jan 18, 2012) - Oak Street Funding (www.oakstreetfunding.com), the nation's leading commission-based lender for insurance professionals, announced a new partnership with GroupSource that will deliver savings to insurance agents and brokers on business supplies and services. Through group purchasing power, GroupSource delivers price savings of between 15 to 20 percent across various supply and service areas, while making the entire support services process more efficient and providing office staff more time to focus on core business activity.