Lewis & Short

praebĭtor, ōris, m. [praebeo]. In gen., a giver, furnisher, supplier (rare but class.): usitati muneris, Ambros. Job et Dav. 2, 5, 20.
Esp.,

    1. 1. Minister et praebitor, who provided support for the officers of the government visiting the province, * Cic. Off. 2, 15, 53.
    2. 2. A purveyor, contractor for government, Inscr. Giorn. Arcad. t. 24, p. 82.