22.__Incorporated nonprofit providers of certain support systems for single-parent families.__Sales to incorporated nonprofit organizations engaged primarily in providing support systems for single-parent families for the development of psychological and economic self-sufficiency;

23.__Nonprofit home construction organizations.__Sales to local branches of incorporated nonprofit organizations whose purpose is to construct low-cost housing for low-income people;

24. Vietnam veteran registries.__Sales to incorporated, nonprofit organizations whose sole purpose is to create, maintain and update a registry of Vietnam veterans;

25.__Organizations providing certain services for hearing- impaired persons.__Sales to incorporated nonprofit organizations whose primary purposes are to promote public understanding of hearing impairment and to assist hearing-impaired persons through the dissemination of information about hearing impairment to the general public and referral to and coordination of community resources available to hearing-impaired persons;

26.__State-chartered credit unions.__Sales to credit unions that are organized under the laws of this State.__This subsection remains in effect only for the time that federally chartered credit unions are, by reason of federal law, exempt from payment of the tax imposed by this chapter;

27.__Nonprofit housing development organizations.__Sales to nonprofit organizations whose primary purpose is to develop housing for low-income people;

28.__Eye banks.__Sales to nonprofit organizations whose primary purpose is to obtain, medically evaluate and distribute eyes for use in corneal transplantation, research and education;

29.__Centers for innovation.__Sales to centers for innovation as described in Title 5, section 13141; and

30.__Sales for resale.__Sales of services to another service provider for resale.