(c) Commodities or contractual services available only from a single source may be excepted from the competitive-solicitation requirements. If an agency believes that commodities or contractual services are available only from a single source, the agency shall electronically post a description of the commodities or contractual services sought for at least 7 business days. The description must include a request that prospective vendors provide information regarding their ability to supply the commodities or contractual services described. If it is determined in writing by the agency, after reviewing any information received from prospective vendors that the commodities or contractual services are available only from a single source, the agency shall
provide notice of its intended decision to enter a single-source purchase contract in the manner specified in s. 120.57(3).