If the several parts of the work or labor to be done or the supplies, material, and
equipment to be furnished shall together or in part involve an expenditure of more
than $2,499.99 but less than $50,000.00, the same may be procured on order awarded
to the lowest responsible bidder upon written bids submitted without public advertisement,
under such regulation as shall be made by the county authority. Purchase of $2,499.00
or less may be made without competition. All work or labor solicitations, or solicitations
for supplies, materials, or equipment to be let shall be made available for public
review in the county purchasing office.