Ala. Code § 45-36-180.05
The county engineer is hereby designated as the person authorized to make requisitions in writing to the county commission for per diem and other expenses, provided, when contracts are to be let or when equipment is to be purchased, lease-purchased, or rented involving more than two thousand dollars ($2,000), the engineer shall notify the county commission two weeks in advance and shall obtain approval and signatures of the majority of the commissioners for such transactions. The engineer shall purchase all articles, materials, supplies, and equipment when possible through the State Department of Transportation; he or she shall at all times obtain at least three bids on such items; and he or she shall use standardized equipment where possible, so that more companies may bid on such. The engineer shall post a monthly ledger on the wall of the entry of the office of the department of public works, visible to the public, with a statement of all articles, material, and equipment purchased in the prior month, stating both the price and from whom the purchases were made.
Ala. Code § 45-36-180.05 (1975)