Ohio Rev. Code § 5549.21
The board of township trustees may purchase or lease such machinery and tools as are necessary for use in constructing, reconstructing, maintaining, and repairing roads and culverts within the township, and shall provide suitable places for housing and storing machinery and tools owned by the township. It may purchase such material and employ such labor as is necessary for carrying into effect this section, or it may authorize the purchase or employment of such material and labor by one of its number, or by the township highway superintendent, at a price to be fixed by the board. All payments on account of machinery, tools, material, and labor shall be made from the township road fund. Except as otherwise provided in sections 505.08, 505.101, and 5513.01 of the Revised Code, all purchases of materials, machinery, and tools shall, if the amount involved exceeds the amount specified in section 9.17 of the Revised Code, be made from the lowest responsible bidder after advertisement, as provided in section 5575.01 of the Revised Code.
If, in compliance with section 505.10 of the Revised Code, the board wishes to sell machinery, equipment, or tools owned by the township to the person from whom it is to purchase other machinery, equipment, or tools, the board may offer, if the amount of the purchase alone involved does not exceed the amount specified in section 9.17 of the Revised Code, to sell such machinery, equipment, or tools and have the amount credited by the vendor against the purchase of the other machinery, equipment, or tools. If the purchase price of the other machinery, equipment, or tools alone exceeds the amount specified in section 9.17 of the Revised Code, the board may give notice to the competitive bidders of its willingness to accept offers for the purchase of the old machinery, equipment, or tools, and those offers shall be subtracted from the selling price of the other machinery, equipment, or tools as bid, in determining the lowest responsible bidder. Notice of the willingness of the board to accept offers for the purchase of the old machinery, equipment, or tools shall be made as a part of the advertisement for bids.
R.C. § 5549.21