It looks like BuyBuyBaby is clearing out old stock of the Diono 2AX car seat in Grey.
It is marked down to $149.99 in your cart, and then using one of the standard 20% off coupons it brings it down to $119.99(+tax). From what I can see this is a steal.
This model is a little larger then their 3RXT so it may not fit 3 across in most mid/small size cars.
https://www.buybuybaby.