Indiana Code Title 36. Local Government § 36-1-7-12

Sec. 12. (a) Whenever a contract provides for the purchase, sale, or exchange of services, supplies, or equipment between or among Indiana governmental entities only, no notice by publication or posting is required.

(b) Whenever a contract provides for one (1) Indiana governmental entity to make a purchase for another, compliance by the one with the applicable statutes governing public bids constitutes compliance by the other.

(c) A governmental entity may make a purchase from any other governmental entity or under another governmental entity's referenced written contract if there is compliance with state purchasing law by the original purchasing unit.

(d) Two (2) or more governmental entities may procure together or with a nonprofit entity if the requirements of the public purchasing statutes are met.