Vendors and suppliers interested in doing business with Allegheny County can review open solicitations for Purchasing and Supplies bids on the Bonfire website. Type or print neatly in inN when filling out this form.Incomplete form will be returned to the applicant. Any vendor wishing to conduct business with Allegheny County must have a current W-9 form on file. Failure to complete this form and submit it with the bid may be sufficient cause for rejection of bid or proposal.