tournament used Grey Marble for about 1150 + shipping from Tornadofoosball.com
this is not owned by Tornado it is owned by Charles McKintosh 336-210-1194...he may have other more used coin-ops for less - he is in Summerfield, just north of Greensboro, NC
the other option is to look in Craigs list and be patient or ebay - just take your time and don't be in a hurry, it is a lot of money to spend not to get what you really want/need