I've purchased the new mounting and center bolts from local dealers without any issues. Sounds like your stealers are just lazy. I think the center bolts are around $7, but you might be able to get a stronger (grade 9) from a nuts & bolts shop for less than that.
Last time I was at the parts desk, they said Ford discontinued the FRONT mount nuts (with the attached washers), but the other mount bolts were still being produced.
