I usually provide access to a few of my best contacts, mortgage, appraiser, inspectors, etc like most agents do. Trying to stay impartial.
I also provide a link for utilities service provider (Cable TV, Internet, Security system, etc.) where they pick and choose discounted products. It's available nationwide (HSmoveConcierge.ACNDirect.com)
Some states where energy (Gas & Electricity) is deregulated, is also offered.