The standard method the County uses to acquire goods or services is the Invitation to Bid process. Vendor registration is free.Use of pencil is prohibited. 2. On this page, you will find: Document Checklists: These checklists outline the required documents for the most common application types. Use of pencil is prohibited. You can view all open solicitations. Prospective Proposers may obtain the Request for Proposal documents from the Miami-Dade Aviation Department, Contracts Administration Division, 4200. When filling out the bid proposal form, bidders are required to complete bid proposal in ink. 1.