The cost of the cabinet is flexible. You can add everything I did or you can skip putting in a coin box and marquee for now. I built into the cabinet a new PC and new 19" monitor. This upped the cost considerably but is somewhere you can save money. You likely will have a spare PC available that will run most of the MAME games quite nicely. The roms can be obtained from a variety of sources.

I was able to find some items on ebay and paid substantially less than retail price for them. Do a little looking and you can save yourself a fair amount of money.

A complete list of items is included.  An abbreviated list of the more expensive items follows: