I would recommend contacting the real estate board in your
area. Your husband is probably a part of it already in your
community. When you contact them, they should have pricing and IDX
connectivity information available for you. For instance, if your
husband goes to a specific location to do his MLS lookups in the
office, the company / organization that provides that service would
have the IDX info and probably could point you in the right
direction if they don't. Once you get connected to the source, I
imagine they have specifics on what needs to be done (i.e.
scripting requirements on the site).