there are the following locks that need to be changedSteering LockGlove compartment LockTrunk/gas Lock (below driver seat)Front door locks (two)Rear seat fold down lock (if its present)Trunk Locksince its a 1999 honda accord you might have an engine disable system on it which means the key should have an electronic chip in it. the cost would be the price of the followingBlank key with ChipKey Cutting/Chip Programming7 New Lock TumblersLaborNormal Labor these days are $85/hr ~ $90/hr atleast here in the East coast (I am from NJ). You will be lucky to get all these things changed and reprogrammed for under $500.