Yep! Camry's a good for 3-across. You may need to buy new car seats to replace the ones you have now- but that's cheaper than buying a new car.
http://www.car-seat.org/search.php?searchid=3794361 Here are suggestions for what has been successfully installed already. Do you how to check that the seats are independently tight? Here's how
http://www.car-seat.org/showthread.php?t=135760
If you want help specific to your car and your existing car seats, feel free to start a new thread asking for help. The technicians (those with green, red and purple names) will want to know what seats your children are in now, how old the children are, weight, and torso height. To get torso height, sit the child cross legged against a wall and measure from bum to shoulder. Good luck