How Much Does a Stop Sign Cost?

Curious how much the County charges for street signage? See below. This is a screen shot of an Orange County Public Works Department "bill" from the County to Lennar Homes' Horizon West Spring Hill Storey Grove development. From this document we also learned that street signage is actually referred to collectively as "traffic control devices" and that it's the Fire Marshall who chooses where "No Parking" signs are placed.