If you're in the market for a new car,you may be eligible for some deals thatyou won't see advertised on TV or in thenewspaper. Certain groups, such as activeor retired military personnel, may be ableto score an extra discount on a newGeneral Motors (GM) car, on top of anyrebates the rest of the general public is eligiblefor. AARP members and recent collegegraduates are also among those whomay be able to receive extra incentives onsome GM models. Ford has similar offers,including an extra $500 rebate for FarmBureau members. Unfortunately, youcan't check on these deals at one convenientWeb site. Consumer gurus recommendgoing to the Web sites of the individualcarmakers or calling their toll-freenumbers to uncover any special bargains.