Toys r us is having a sale on Diono radian rxt convertible car seats. they are $233.99 but now through October 1st, you can get an additional 25% off. You just might have to call into their customer service line and place the order over the phone because when I tried to use the promo code Safety25 it didn't accept it, but when I called they had to get a code from the manager so it would accept it.
I was not on the phone with customer service that long...
The total comes to $186.02 and you get free shipping.

Trust me it's worth it. Originally the car seat is 299.99 before taxes or shipping.